The rate of simple interest for which a sum of money becomes 5 times of itself i

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The rate of simple interest for which a sum of money becomes 5 times of itself in 8 years is :

Options:

A . 40%

B . 30%

C . 55%

D . 50%

Answer: Option D
Answer: (d)Principal = Rs.x (let)Amount = Rs.5xInterest = Rs.(5x - x) = Rs.4xRate = ${S.I. × 100}/\text"Principal × Time"$= ${4x × 100}/{x × 8}$ = 50% per annum

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