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A trader bought a number of …

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A trader bought a number of articles for rs.900. Five were damaged and he sold each of the rest at rs.2 more than what he paid for it, thus getting a profit of rs.80 on the whole transaction. Find the number of articles he bought.

    • Posted by Reet Kaur 5 years, 4 months ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    ? Pranali.A.P ? 5 years, 4 months ago

    Number of articles=x( say)......... therefore c.pof per article= 900/x........ profit on s.p= (x-5)2................. real profit=( x-5)2- 5(900/x)................ . given profit = 80 ......................... therefore(x-5)2-5(900/x)= 80........................ 2x- 10-4500/x= 80................... 2x^2 -10x- 4500= 80x..................... x^2 -5x-2250=40x................... x^2-45x- 2250=0............... x^2-75x+30x-2250=0................. (x-75)(x+30)=0.............. therefore,............ number of articles=75............

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