Question
The compound interest on a certain sum for 2 years at 10% per annum is Rs. 525 . The simple interest on the same sum for double the time at half the rate percent per annum is :
Answer: Option B
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Let the sum be Rs. P , Then
`[P(1 + 10/100)^2 - P] = 525`
`hArr P[(11/10)^2 - 1] = 525`
`hArr P = ((525 xx 100)/(21))` = 2500
`:.` Sum = Rs. 2500
So , S.I. = Rs. `((2500 xx 5 xx 4)/(100)) ` = Rs. 500
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