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    Question

    A man invested certain sum at 5% p.a. simple interest

    for his son who was 15 years old. If the amount received by the son when he was 30 years old is Rs. 7200, then find the sum invested by the man.
    A Rs. 4200 Correct Answer Incorrect Answer
    B Rs. 4300 Correct Answer Incorrect Answer
    C Rs. 4500 Correct Answer Incorrect Answer
    D Rs. 4550 Correct Answer Incorrect Answer

    Solution

    Let the sum invested by the man be Rs. x Time for which the sum is invested = 30 – 15 = 15 years According to the question, {(x × 5 × 15)/100} + x = 7200 Or, 1.6x = 7200 Or, x = 4500 Therefore, the sum invested by the man = Rs. 4500

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