At what per cent of simple interest will a sum of money double itself in 15 year

Question

At what per cent of simple interest will a sum of money double itself in 15 years?

Options:

A . 6$2/3$%

B . 6$1/3$%

C . 6%

D . 6$1/2$%

Answer: Option A
Answer: (a)Let principal be Rs.x.Amount = Rs.2xInterest = Rs.(2x - x) = Rs.xRate = ${S.I. × 100}/\text"Principal × Time"$= ${x × 100}/{x × 15} = 20/3$= 6$2/3%$ per annum

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