{"id":4313,"date":"2016-05-13T11:49:00","date_gmt":"2016-05-13T06:19:00","guid":{"rendered":"http:\/\/mycbseguide.com\/blog\/ncert-solutions-class-7-maths-comparing-quantities-ex-8-3\/"},"modified":"2018-07-07T11:56:08","modified_gmt":"2018-07-07T06:26:08","slug":"ncert-solutions-for-class-7-maths-exercise-8-3","status":"publish","type":"post","link":"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-maths-exercise-8-3\/","title":{"rendered":"NCERT Solutions for Class 7 Maths Exercise 8.3"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_76 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-maths-exercise-8-3\/#NCERT_Solutions_for_Class_7_Maths_Comparing_Quantities\" >NCERT Solutions for Class 7 Maths\u00a0Comparing Quantities<\/a><ul class='ez-toc-list-level-6' ><li class='ez-toc-heading-level-6'><ul class='ez-toc-list-level-6' ><li class='ez-toc-heading-level-6'><ul class='ez-toc-list-level-6' ><li class='ez-toc-heading-level-6'><ul class='ez-toc-list-level-6' ><li class='ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-maths-exercise-8-3\/#Class_%E2%80%93VII_Mathematics_Ex_83\" >Class \u2013VII Mathematics (Ex. 8.3)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-maths-exercise-8-3\/#Question_1Tell_what_is_the_profit_or_loss_in_the_following_transactions_Also_find_profit_percent_or_loss_percent_in_each_case\" >Question 1.Tell what is the profit or loss in the following transactions. Also find profit percent or loss percent in each case.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-maths-exercise-8-3\/#Question_2Convert_each_part_of_the_ratio_to_percentage\" >Question 2.Convert each part of the ratio to percentage:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-maths-exercise-8-3\/#Question_3The_population_of_a_city_decreased_from_25000_to_24500_Find_the_percentage_decrease\" >Question 3.The population of a city decreased from 25,000 to 24,500. Find the percentage decrease.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-maths-exercise-8-3\/#Question_4Arun_bought_a_car_for_Rs_350000_The_next_year_the_price_went_up_to_Rs_370000_What_was_the_percentage_of_price_increase\" >Question 4.Arun bought a car for Rs. 3,50,000. The next year, the price went up to Rs. 3,70,000. What was the percentage of price increase?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-maths-exercise-8-3\/#Question_5I_buy_a_TV_for_Rs_10000_and_sell_it_at_a_profit_of_20_How_much_money_do_I_get_for_it\" >Question 5.I buy a T.V. for Rs. 10,000 and sell it at a profit of 20%. How much money do I get for it?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-maths-exercise-8-3\/#Question_6Juhi_sells_a_washing_machine_for_Rs_13500_She_loses_20_in_the_bargain_What_was_the_price_at_which_she_bought_it\" >Question 6.Juhi sells a washing machine for Rs. 13,500. She loses 20% in the bargain. What was the price at which she bought it?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-maths-exercise-8-3\/#Question_7i_Chalk_contains_Calcium_Carbon_and_Oxygen_in_the_ratio_10_3_12_Find_the_percentage_of\" >Question 7.(i) Chalk contains Calcium, Carbon and Oxygen in the ratio 10 : 3 : 12. Find the percentage of<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-maths-exercise-8-3\/#Question_8Amina_buys_a_book_for_Rs_275_and_sells_it_at_a_loss_of_15_How_much_does_she_sell_it_for\" >Question 8.Amina buys a book for Rs. 275 and sells it at a loss of 15%. How much does she sell it for?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-maths-exercise-8-3\/#Question_9Find_the_amount_to_be_paid_at_the_end_of_3_years_in_each_case\" >Question 9.Find the amount to be paid at the end of 3 years in each case:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-maths-exercise-8-3\/#Question_10What_rate_gives_Rs_280_as_interest_on_a_sum_of_Rs_56000_in_2_years\" >Question 10.What rate gives Rs. 280 as interest on a sum of Rs. 56,000 in 2 years?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-maths-exercise-8-3\/#Question_11If_Meena_gives_an_interest_of_Rs_45_for_one_year_at_9_rate_pa_What_is_the_sum_she_has_borrowed\" >Question 11.If Meena gives an interest of Rs. 45 for one year at 9% rate p.a. What is the sum she has borrowed?<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-maths-exercise-8-3\/#NCERT_Solutions_for_Class_7_Maths_Exercise_83\" >NCERT Solutions for Class 7 Maths Exercise 8.3<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-maths-exercise-8-3\/#CBSE_app_for_Students\" >CBSE app for Students<\/a><\/li><\/ul><\/nav><\/div>\n<p>NCERT Solutions for Class 7 Maths Exercise 8.3 book solutions are available in PDF format for free download. These ncert book chapter wise questions and answers are very helpful for CBSE exam. CBSE recommends NCERT books and most of the questions in CBSE exam are asked from NCERT text books. Class 7 Maths chapter wise NCERT solution for Maths Book all the chapters can be downloaded from our website and myCBSEguide mobile app for free.<\/p>\n<p style=\"text-align: center;\"><strong>NCERT solutions for Maths\u00a0Comparing Quantities\u00a0<\/strong><strong><a class=\"button\" href=\"https:\/\/mycbseguide.com\/downloads\/cbse-class-07-mathematics-comparing-quantities\/1517\/ncert-solutions\/5\/\">Download as PDF<\/a><\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/media-mycbseguide.s3.ap-south-1.amazonaws.com\/images\/blog\/07_Maths_Book.jpg\" alt=\"NCERT Solutions for Class 7 Maths Exercise 8.3\" width=\"162\" height=\"205\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Solutions_for_Class_7_Maths_Comparing_Quantities\"><\/span>NCERT Solutions for Class 7 Maths\u00a0Comparing Quantities<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h6 style=\"text-align: center;\"><span class=\"ez-toc-section\" id=\"Class_%E2%80%93VII_Mathematics_Ex_83\"><\/span><strong>Class \u2013VII Mathematics (Ex. 8.3)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<h6><span class=\"ez-toc-section\" id=\"Question_1Tell_what_is_the_profit_or_loss_in_the_following_transactions_Also_find_profit_percent_or_loss_percent_in_each_case\"><\/span><strong>Question 1.<\/strong>Tell what is the profit or loss in the following transactions. Also find profit percent or loss percent in each case.<span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p>(a) Gardening shears bought for Rs. 250 and sold for Rs. 325.<\/p>\n<p>(b) A refrigerator bought Rs. 12,000 and sold at Rs. 13,500.<\/p>\n<p>(c) A cupboard bought for Rs. 2,500 and sold at Rs. 3,000.<\/p>\n<p>(d) A skirt bought for Rs. 250 and sold at Rs. 150.<\/p>\n<p><strong>Answer:<\/strong><\/p>\n<p>(a) Cost price of gardening shears = Rs. 250<\/p>\n<p>Selling price of gardening shears = Rs. 325<\/p>\n<p>Since, S.P. &gt; C.P., therefore here is profit.<\/p>\n<p>{tex}\\therefore {\/tex} Profit = S.P. \u2013 C.P. = 325 \u2013 250 = Rs. 75<\/p>\n<p>Now Profit% = {tex}\\frac{{{\\text{Profit}}}}{{{\\text{C}}{\\text{.P}}{\\text{.}}}} \\times 100{\/tex}<\/p>\n<p>= {tex}\\frac{{75}}{{250}} \\times 100{\/tex} = 30%<\/p>\n<p>Therefore, Profit = Rs. 75 and Profit% = 30%<\/p>\n<p>(b) Cost price of refrigerator = Rs. 12,000<\/p>\n<p>Selling price of refrigerator = Rs. 13,500<\/p>\n<p>Since, S.P. &gt; C.P., therefore here is profit.<\/p>\n<p>{tex}\\therefore {\/tex} Profit = S.P. \u2013 C.P. = 13500 \u2013 12000 = Rs. 1,500<\/p>\n<p>Now Profit% = {tex}\\frac{{{\\text{Profit}}}}{{{\\text{C}}{\\text{.P}}{\\text{.}}}} \\times 100{\/tex}<\/p>\n<p>= {tex}\\frac{{1500}}{{12000}} \\times 100{\/tex} = 12.5%<\/p>\n<p>Therefore, Profit = Rs. 1,500 and Profit% = 12.5%<\/p>\n<p>(c) Cost price of cupboard = Rs. 2,500<\/p>\n<p>Selling price of cupboard = Rs. 3,000<\/p>\n<p>Since, S.P. &gt; C.P., therefore here is profit.<\/p>\n<p>{tex}\\therefore {\/tex} Profit = S.P. \u2013 C.P. = 3,000 \u2013 2,500 = Rs. 500<\/p>\n<p>Now Profit% = {tex}\\frac{{{\\text{Profit}}}}{{{\\text{C}}{\\text{.P}}{\\text{.}}}} \\times 100{\/tex}<\/p>\n<p>= {tex}\\frac{{500}}{{2500}} \\times 100{\/tex} = 20%<\/p>\n<p>Therefore, Profit = Rs. 500 and Profit% = 20%<\/p>\n<p>(d) Cost price of skirt = Rs. 250<\/p>\n<p>Selling price of skirt = Rs. 150<\/p>\n<p>Since, C.P. &gt; S.P., therefore here is loss.<\/p>\n<p>{tex}\\therefore {\/tex} Loss = C.P. \u2013 S.P. = 250 \u2013 150 = Rs. 100<\/p>\n<p>Now Loss% = {tex}\\frac{{{\\text{Loss}}}}{{{\\text{C}}{\\text{.P}}{\\text{.}}}} \\times 100{\/tex}<\/p>\n<p>= {tex}\\frac{{100}}{{250}} \\times 100{\/tex} = 40%<\/p>\n<p>Therefore, Profit = Rs. 100 and Profit% = 40%<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 7 Maths Exercise 8.3<\/p>\n<h6><span class=\"ez-toc-section\" id=\"Question_2Convert_each_part_of_the_ratio_to_percentage\"><\/span><strong>Question 2.<\/strong>Convert each part of the ratio to percentage:<span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p>(a) 3 : 1<\/p>\n<p>(b) 2 : 3 : 5<\/p>\n<p>(c) 1 : 4<\/p>\n<p>(d) 1 : 2 : 5<\/p>\n<p><strong>Answer:<\/strong><\/p>\n<p>(a) 3 : 1<\/p>\n<p>Total part = 3 + 1 = 4<\/p>\n<p>Therefore, Fractional part = {tex}\\frac{3}{4}:\\frac{1}{4}{\/tex}<\/p>\n<p>{tex} \\Rightarrow {\/tex} Percentage of parts = {tex}\\frac{3}{4} \\times 100:\\frac{1}{4} \\times 100{\/tex}<\/p>\n<p>{tex} \\Rightarrow {\/tex} Percentage of parts = 75% : 25%<\/p>\n<p>(b) 2 : 3 : 5<\/p>\n<p>Total part = 2 + 3 + 5 = 10<\/p>\n<p>Therefore, Fractional part = {tex}\\frac{2}{{10}}:\\frac{3}{{10}}:\\frac{5}{{10}}{\/tex}<\/p>\n<p>{tex} \\Rightarrow {\/tex} Percentage of parts = {tex}\\frac{2}{{10}} \\times 100:\\frac{3}{{10}} \\times 100:\\frac{5}{{10}} \\times 100{\/tex}<\/p>\n<p>{tex} \\Rightarrow {\/tex} Percentage of parts = 20% : 30% : 50%<\/p>\n<p>(c) 1 : 4<\/p>\n<p>Total part = 1 + 4 = 5<\/p>\n<p>Therefore, Fractional part = {tex}\\frac{1}{5}:\\frac{4}{5}{\/tex}<\/p>\n<p>{tex} \\Rightarrow {\/tex} Percentage of parts = {tex}\\frac{1}{5} \\times 100:\\frac{4}{5} \\times 100{\/tex}<\/p>\n<p>{tex} \\Rightarrow {\/tex} Percentage of parts = 20% : 80%<\/p>\n<p>(d) 1 : 2 : 5<\/p>\n<p>Total part = 1 + 2 + 5 = 8<\/p>\n<p>Therefore, Fractional part = {tex}\\frac{1}{8}:\\frac{2}{8}:\\frac{5}{8}{\/tex}<\/p>\n<p>{tex} \\Rightarrow {\/tex} Percentage of parts = {tex}\\frac{1}{8} \\times 100:\\frac{2}{8} \\times 100:\\frac{5}{8} \\times 100{\/tex}<\/p>\n<p>{tex} \\Rightarrow {\/tex} Percentage of parts = 12.5% : 25% : 62.5%<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 7 Maths Exercise 8.3<\/p>\n<h6><span class=\"ez-toc-section\" id=\"Question_3The_population_of_a_city_decreased_from_25000_to_24500_Find_the_percentage_decrease\"><\/span><strong>Question 3.<\/strong>The population of a city decreased from 25,000 to 24,500. Find the percentage decrease.<span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>Answer:<\/strong><\/p>\n<p>The decreased population of a city from 25,000 to 24,500.<\/p>\n<p>Population decreased = 25,000 \u2013 24,500 = 500<\/p>\n<p>Decreased Percentage = {tex}\\frac{{{\\text{Population decreased}}}}{{{\\text{Original population}}}} \\times 100{\/tex}<\/p>\n<p>= {tex}\\frac{{500}}{{25000}} \\times 100{\/tex} = 2%<\/p>\n<p>Hence, the percentage decreased is 2%.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 7 Maths Exercise 8.3<\/p>\n<h6><span class=\"ez-toc-section\" id=\"Question_4Arun_bought_a_car_for_Rs_350000_The_next_year_the_price_went_up_to_Rs_370000_What_was_the_percentage_of_price_increase\"><\/span><strong>Question 4.<\/strong>Arun bought a car for Rs. 3,50,000. The next year, the price went up to Rs. 3,70,000. What was the percentage of price increase?<span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>Answer:<\/strong><\/p>\n<p>Increased in price of a car from Rs. 3,50,000 to Rs. 3,70,000.<\/p>\n<p>Amount change = Rs. 3,70,000 \u2013 Rs. 3,50,000 = Rs. 20,000.<\/p>\n<p>Therefore, Increased percentage = {tex}\\frac{{{\\text{Amount of change}}}}{{{\\text{Original amount}}}} \\times 100{\/tex}<\/p>\n<p>= {tex}\\frac{{20000}}{{350000}} \\times 100{\/tex} = {tex}5\\frac{5}{7}\\% {\/tex}<\/p>\n<p>Hence, the percentage of price increased is {tex}5\\frac{5}{7}\\% .{\/tex}<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 7 Maths Exercise 8.3<\/p>\n<h6><span class=\"ez-toc-section\" id=\"Question_5I_buy_a_TV_for_Rs_10000_and_sell_it_at_a_profit_of_20_How_much_money_do_I_get_for_it\"><\/span><strong>Question 5.<\/strong>I buy a T.V. for Rs. 10,000 and sell it at a profit of 20%. How much money do I get for it?<span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>Answer:<\/strong><\/p>\n<p>The cost price of T.V. = Rs. 10,000<\/p>\n<p>Profit percent = 20%<\/p>\n<p>Now, Profit = Profit% of C.P.<\/p>\n<p>= {tex}\\frac{{20}}{{100}} \\times 10000{\/tex} = Rs. 2,000<\/p>\n<p>Selling price = C.P. + Profit<\/p>\n<p>= 10,000 + 2,000 = Rs. 12,000<\/p>\n<p>Hence, he gets Rs. 12,000 on selling his T.V.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 7 Maths Exercise 8.3<\/p>\n<h6><span class=\"ez-toc-section\" id=\"Question_6Juhi_sells_a_washing_machine_for_Rs_13500_She_loses_20_in_the_bargain_What_was_the_price_at_which_she_bought_it\"><\/span><strong>Question 6.<\/strong>Juhi sells a washing machine for Rs. 13,500. She loses 20% in the bargain. What was the price at which she bought it?<span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>Answer:<\/strong><\/p>\n<p>Selling price of washing machine = Rs. 13,500<\/p>\n<p>Loss percent = 20%<\/p>\n<p>Let the cost price of washing machine be Rs.{tex}x.{\/tex}<\/p>\n<p>Since, Loss = Loss% of C.P.<\/p>\n<p>{tex} \\Rightarrow {\/tex} Loss = 20% of Rs.{tex}x{\/tex} = {tex}\\frac{{20}}{{100}} \\times x = \\frac{x}{5}{\/tex}<\/p>\n<p>Therefore, S.P. = C.P. \u2013 Loss<\/p>\n<p>{tex} \\Rightarrow {\/tex} 13500 = {tex}x &#8211; \\frac{x}{5}{\/tex} {tex} \\Rightarrow {\/tex} 13500 = {tex}\\frac{{4x}}{5}{\/tex}<\/p>\n<p>{tex} \\Rightarrow {\/tex} {tex}x = \\frac{{13500 \\times 5}}{4}{\/tex} = Rs. 16,875<\/p>\n<p>Hence, the cost price of washing machine is Rs. 16,875.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 7 Maths Exercise 8.3<\/p>\n<h6><span class=\"ez-toc-section\" id=\"Question_7i_Chalk_contains_Calcium_Carbon_and_Oxygen_in_the_ratio_10_3_12_Find_the_percentage_of\"><\/span><strong>Question 7.<\/strong>(i) Chalk contains Calcium, Carbon and Oxygen in the ratio 10 : 3 : 12. Find the percentage of<span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p>Carbon in chalk.<\/p>\n<p>(ii) If in a stick of chalk, Carbon is 3 g, what is the weight of the chalk stick?<\/p>\n<p><strong>Answer:<\/strong><\/p>\n<p>(i) Given ratio = 10 : 3 : 12<\/p>\n<p>Total part = 10 + 3 + 12 = 25<\/p>\n<p>Part of Carbon = {tex}\\frac{3}{{25}}{\/tex}<\/p>\n<p>Percentage of Carbon part in chalk = {tex}\\frac{3}{{25}} \\times 100{\/tex} = 12%<\/p>\n<p>(ii) Quantity of Carbon in chalk stick = 3 g<\/p>\n<p>Let the weight of chalk be {tex}x{\/tex} g.<\/p>\n<p>Then, 12% of {tex}x{\/tex} = 3<\/p>\n<p>{tex} \\Rightarrow {\/tex} {tex}\\frac{{12}}{{100}} \\times x = 3{\/tex} {tex} \\Rightarrow {\/tex} {tex}x = \\frac{{3 \\times 100}}{{12}}{\/tex} = 25 g<\/p>\n<p>Hence the weight of chalk stick is 25 g.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 7 Maths Exercise 8.3<\/p>\n<h6><span class=\"ez-toc-section\" id=\"Question_8Amina_buys_a_book_for_Rs_275_and_sells_it_at_a_loss_of_15_How_much_does_she_sell_it_for\"><\/span><strong>Question 8.<\/strong>Amina buys a book for Rs. 275 and sells it at a loss of 15%. How much does she sell it for?<span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>Answer:<\/strong><\/p>\n<p>The cost of a book = Rs. 275<\/p>\n<p>Loss percent = 15%<\/p>\n<p>Loss = Loss% of C.P. = 15% of Rs. 275<\/p>\n<p>= {tex}\\frac{{15}}{{100}} \\times 275{\/tex} = Rs. 41.25<\/p>\n<p>Therefore, S.P. = C.P. \u2013 Loss<\/p>\n<p>= 275 \u2013 41.25 = Rs. 233.75<\/p>\n<p>Hence, Amina sells a book for Rs. 233.75.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 7 Maths Exercise 8.3<\/p>\n<h6><span class=\"ez-toc-section\" id=\"Question_9Find_the_amount_to_be_paid_at_the_end_of_3_years_in_each_case\"><\/span><strong>Question 9.<\/strong>Find the amount to be paid at the end of 3 years in each case:<span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p>(a) Principal = Rs. 1,200 at 12% p.a.<\/p>\n<p>(b) Principal = Rs. 7,500 at 5% p.a.<\/p>\n<p><strong>Answer:<\/strong><\/p>\n<p>(a) Here, Principal (P) = Rs. 1,200, Rate (R) = 12% p.a., Time (T) = 3 years<\/p>\n<p>Simple Interest = {tex}\\frac{{{\\text{P }} \\times {\\text{ R }} \\times {\\text{ T}}}}{{100}}{\/tex} = {tex}\\frac{{1200 \\times 12 \\times 3}}{{100}}{\/tex}<\/p>\n<p>= Rs. 432<\/p>\n<p>Now, Amount = Principal + Simple Interest<\/p>\n<p>= 1200 + 432<\/p>\n<p>= Rs. 1,632<\/p>\n<p>(b) Here, Principal (P) = Rs. 7,500, Rate (R) = 5% p.a., Time (T) = 3 years<\/p>\n<p>Simple Interest = {tex}\\frac{{{\\text{P }} \\times {\\text{ R }} \\times {\\text{ T}}}}{{100}}{\/tex} = {tex}\\frac{{7500 \\times 5 \\times 3}}{{100}}{\/tex}<\/p>\n<p>= Rs. 1,125<\/p>\n<p>Now, Amount = Principal + Simple Interest<\/p>\n<p>= 7,500 + 1,125<\/p>\n<p>= Rs. 8,625<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 7 Maths Exercise 8.3<\/p>\n<h6><span class=\"ez-toc-section\" id=\"Question_10What_rate_gives_Rs_280_as_interest_on_a_sum_of_Rs_56000_in_2_years\"><\/span><strong>Question 10.<\/strong>What rate gives Rs. 280 as interest on a sum of Rs. 56,000 in 2 years?<span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>Answer:<\/strong><\/p>\n<p>Here, Principal (P) = Rs. 56,000, Simple Interest (S.I.) = Rs. 280, Time (T) = 2 years<\/p>\n<p>Simple Interest = {tex}\\frac{{{\\text{P }} \\times {\\text{ R }} \\times {\\text{ T}}}}{{100}}{\/tex}<\/p>\n<p>{tex} \\Rightarrow {\/tex} 280 = {tex}\\frac{{56000 \\times {\\text{R}} \\times 2}}{{100}}{\/tex} {tex} \\Rightarrow {\/tex} R = {tex}\\frac{{280 \\times 100}}{{56000 \\times 2}}{\/tex}<\/p>\n<p>{tex} \\Rightarrow {\/tex} R = 0.25%<\/p>\n<p>Hence, the rate of interest on sum is 0.25%.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 7 Maths Exercise 8.3<\/p>\n<h6><span class=\"ez-toc-section\" id=\"Question_11If_Meena_gives_an_interest_of_Rs_45_for_one_year_at_9_rate_pa_What_is_the_sum_she_has_borrowed\"><\/span><strong>Question 11.<\/strong>If Meena gives an interest of Rs. 45 for one year at 9% rate p.a. What is the sum she has borrowed?<span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>Answer:<\/strong><\/p>\n<p>Simple Interest = Rs. 45, Rate (R) = 9% p.a., Time (T) = 1 years<\/p>\n<p>Simple Interest = {tex}\\frac{{{\\text{P }} \\times {\\text{ R }} \\times {\\text{ T}}}}{{100}}{\/tex}<\/p>\n<p>{tex} \\Rightarrow {\/tex}45= {tex}\\frac{{{\\text{P}} \\times 9 \\times 1}}{{100}}{\/tex}{tex} \\Rightarrow {\/tex} P = {tex}\\frac{{45 \\times 100}}{{9 \\times 1}}{\/tex}<\/p>\n<p>{tex} \\Rightarrow {\/tex}P = Rs. 500<\/p>\n<p>Hence, she borrowed Rs. 500.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Solutions_for_Class_7_Maths_Exercise_83\"><\/span>NCERT Solutions for Class 7 Maths Exercise 8.3<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>NCERT Solutions Class 7 Maths PDF (Download) Free from myCBSEguide app and myCBSEguide website. Ncert solution class 7 Maths includes text book solutions from Class 7 Maths Book . NCERT Solutions for CBSE Class 7 Maths have total 15 chapters. 7 Maths NCERT Solutions in PDF for free Download on our website. Ncert Maths class 7 solutions PDF and Maths ncert class 7 PDF solutions with latest modifications and as per the latest CBSE syllabus are only available in myCBSEguide.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"CBSE_app_for_Students\"><\/span>CBSE app for Students<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>To download NCERT Solutions for Class 7 Maths, Social Science Computer Science, Home Science, Hindi English, Maths Science do check myCBSEguide app or website. myCBSEguide provides sample papers with solution, test papers for chapter-wise practice, NCERT solutions, NCERT Exemplar solutions, quick revision notes for ready reference, CBSE guess papers and CBSE important question papers. Sample Paper all are made available through\u00a0<a href=\"https:\/\/play.google.com\/store\/apps\/details?id=in.techchefs.MyCBSEGuide&amp;referrer=utm_source%3Dmycbse_bottom%26utm_medium%3Dtext%26utm_campaign%3Dmycbseads\"><strong>the best app for CBSE students<\/strong><\/a>\u00a0and myCBSEguide website.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>NCERT Solutions for Class 7 Maths Exercise 8.3 book solutions are available in PDF format for free download. These ncert book chapter wise questions and answers are very helpful for CBSE exam. CBSE recommends NCERT books and most of the questions in CBSE exam are asked from NCERT text books. Class 7 Maths chapter wise &#8230; <a title=\"NCERT Solutions for Class 7 Maths Exercise 8.3\" class=\"read-more\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-7-maths-exercise-8-3\/\" aria-label=\"More on NCERT Solutions for Class 7 Maths Exercise 8.3\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":-1,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1388,281],"tags":[283,1535,321,1485,216],"class_list":["post-4313","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mathematics-cbse-class-07","category-ncert-solutions","tag-cbse-study-material","tag-class-7","tag-mathematics","tag-maths","tag-ncert-solutions"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>NCERT Solutions for Class 7 Maths Exercise 8.3 | myCBSEguide<\/title>\n<meta name=\"description\" content=\"NCERT Solutions for Class 7 Maths Exercise 8.3 in PDF format for free download. 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