Question
A man invested certain sum at 9% p.a. simple interest
for his son who was 18 years old. If the amount received by the son when he was 28 years old is Rs. 10400, 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 = 28 – 18 = 10 years According to the question, {(x × 9 × 10)/100} + x = 10400 Or, 2.08x = 10400 Or, x = 5000 Therefore, the sum invested by the man = Rs. 5000
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