At what rate percent per annum will the simple interest on a sum of money be 2/

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Question

At what rate percent per annum will the simple interest on a sum of money be 2/5 of the amount in 10 years?

Options:

A . 4%

B . 5 2/3 %

C . 6%

D . 6 2/3 %

Answer: Option A

Let sum = x. Then, S.I. = 2x/5, Time = 10 years.Rate = (100 * 2x) / (x * 5 * 10) = 4%

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