maths
posted by maihul .
The difference of compound interest and simple interest on an amount at the rate of 12% per annum for 2 years is Rs. 90/ then the amount will be 

let the amount be x
at compound interest:
amount = x(1.12)^2 = 1.2544x
at simple interest:
x(.12)(2) = .24x
so ....
(1.2544x  x)  .24x = 90
x(1.2544  1  .24) = 90
x(.0144) = 90
x = 6250