A man invested certain sum at 5% p.a. simple interest for his son who was 13 years old. If the amount received by the son when he was 29 years old is Rs. 5760, then find the sum invested by the man.
Let the sum invested by the man be Rs. x Time for which the sum is invested = 29 – 13 = 16 years According to the question, {(x × 5 × 16)/100} + x = 5760 Or, 1.8x = 5760 Or, x = 3200 Therefore, the sum invested by the man = Rs. 3200
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