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    Question

    Amit invested a sum at a certain rate of interest on

    simple interest and he got 90% more amount after 4 years. If he invests Rs. 7200 at the same rate of interest on SI, then find the total interest he would get after 5 years?
    A Rs 2880 Correct Answer Incorrect Answer
    B Rs 8100 Correct Answer Incorrect Answer
    C Rs 2592 Correct Answer Incorrect Answer
    D Rs 1200 Correct Answer Incorrect Answer
    E Rs 3840 Correct Answer Incorrect Answer

    Solution

    Let sum invested by Amit = 100x And amount he got = 190% of 100x = 190x Let rate of interest be ‘r’ % p.a. According to the question – (100x × r × 4)/100 = 190x – 100x R = 22.5%    Required interest = Rs. (7200 × 22.5 × 5)/100 = Rs 8100

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