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 ?
Answer: Option A
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Let sum = `x` Then, S.I. = `(2x)/(5)`, Time = 10 years
`:.` Rate = `((100 xx 2x)/(x xx 5 xx 10))`% = 4%
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