maths
posted by jyoti .
simple interest and compound interest
on what sum will the compound interest at 10% per annum for 3 years compounded annually be Rs 331?

x(1.10)^3 = x + 331
x(1.1)^3  x = 331
x(1.1^3  1) = 331
x = 331/(1.1^3  1) = 1000
check:
1000(1.1^3) = 1331
so the increase (or interest) is 331