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Ramkali required rupees 2500 after 12 …

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Ramkali required rupees 2500 after 12 weeks to send her daughter to school she saved rupees hundred in the first week and increase of reclusive in rupees 20 every week find whether she will be able to send her daughter to school after 12 weeks or not

    • Posted by Yudhveer Soni 6 years ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Gaurav Seth 6 years ago

    First saving = 100
    second saving =120
    third saving = 140
    clearly this is an A.P. series with a=100,
    d=20
    we are to finf the sum of 12 terms of this series
    so,
    sum =( n/2)*(2*a+(n-1)*d)
    sum=(12/2)*(2*100+(12-1)*20)
    sum=6*(200+11*20)
    sum=6*(200+220)
    sum=6*420
    sum=2520
    so she would be able to save Rs. 2520 in 12 months and therefore will be able to send her daughter to school

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