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    Question

    Rs. 4000 when invested at 6% p.a. for (x + 4) years

    gives a simple interest of Rs. 4800. Find the amount received when the same sum is invested at 5% p.a. simple interest for 2.5x years.
    A Rs.7900 Correct Answer Incorrect Answer
    B Rs.8576 Correct Answer Incorrect Answer
    C Rs.7520 Correct Answer Incorrect Answer
    D Rs.8320 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    According to the question,
    (4000 Ă— 6 Ă— (x + 4)) Ă· 100 = 4800
    Or, 240(x + 4) = 4800
    Or, x + 4 = 20
    Or, x = 16
    Therefore, 2.5x = 40 years
    Required amount received = {(4000 × 5 × 40) ÷ 100} + 4000  = (8000) + 4000 = Rs. 12,000

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