Question
A sum was put at simple interest at a certain rate for 2 years . Had it been put at 3% higher rate . it would have fetched Rs. 72 more. The sum is :
Answer: Option A
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Let the sum be Rs. `x` and original rate be R% . Then ,
`(x xx (R + 3) xx 2)/(100) - (x xx R xx 2)/(100) ` = 72
`hArr 2Rx + 6x - 2Rx = 7200`
`hArr 6x = 7200`
`hArr x = 1200`
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