Question
A man invested certain sum at 5% p.a. simple interest
for his son who was 10 years old. If the amount received by the son when he was 30 years old is Rs. 4000, then find the sum invested by the man.Solution
Let the sum invested by the man be Rs. x Time for which the sum is invested = 30 – 10 = 20 years According to the question, {(x × 5 × 20)/100} + x = 4000 Or, 1.6x = 4000 Or, x = 2500 Therefore, the sum invested by the man = Rs. 2500
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