Question
A man invested certain sum at 7.5% p.a. simple interest
for his son who was 11 years old. If the amount received by the son when he was 22 years old is Rs. 6840, 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 = 22 – 11 = 11 years According to the question, {(x × 7.5 × 11)/100} + x = 6840 Or, 1.9x = 6840 Or, x = 3600 Therefore, the sum invested by the man = Rs. 3600
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