If a sum of money doubles itself in 8 years, then the interest rate in percentag

Question

If a sum of money doubles itself in 8 years, then the interest rate in percentage is

Options:

A . 10%

B . 8$1/2$%

C . 12$1/2$%

D . 10$1/2$%

Answer: Option C
Answer: (c)Let principal be Rs. x.Amount = Rs.2xInterest = Rs.(2x - x) = Rs.xRate = ${S.I. × 100}/\text"Principal × Time"$= ${x × 100}/{x × 8} = 25/2$= 12$1/2%$ per annum

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