Question
Simple interest on a certain sum at a certain annual rate of interest is `1/9` of the sum . If the numbers representing rate percent and time in years be equal , then the rate of interest is
Answer: Option A
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Let sum = `x` Then , S.I. = `x/9`.
Let rate = R% and time = R years.
`:.` ` ((x xx R xx R)/(100)) = x/9`
`hArr R^2 = 100/9`
`hArr R = 10/3` = `3 1/3`
Hence , rate = `3 1/3`%.
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