Question
If the simple interest on a certain sum for 15 months at `7 1/2`% per annum exceeds he simple interest on the same sum for 8 months at `12 1/2`% per annum by Rs. 32.50 then the sum( in Rs.) is
Answer: Option C
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Let the sum be Rs. `x`, Then , `( x xx 15/2 xx 5/4 xx 1/100) - (x xx 25/2 xx 2/3 xx 1/100)` = 3250
`hArr (75x)/(8) - (25x)/(3) = 3250`
`hArr 25x = 3250 xx 24`
`hArr x = ((3250 xx 24)/(25))` = 3120
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