Question
Simple interest on a certain amount is `9/16` of the principal . If the numbers representing the rate of interest in percent and time in years be equal , than time ,for which the principal is lent out is
Answer: Option D
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Let sum = `x` . Then , S.I. = `9/16 x`.
Let rate = R% and time = R years
`:.` ` ((x xx R xx R)/(100)) = (9x)/(16)`
`hArr R^2 = 900/16` `hArr R = 30/4 = 7 1/2`
Hence , time = `7 1/2` years
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