the difference between the compound interest compounded annually and simple interest for 2 years at 20 % per annum is rs . 360 . find the principal ?
"p = 360 ( 100 / 5 ) ^ 2 = > p = 9000 answer : c"
divide(360, subtract(power(add(divide(20, const_100), const_1), 2), add(multiply(divide(20, const_100), 2), const_1)))