the difference between the compound interest compounded annually and simple interest for 2 years at 20 % per annum is rs . 216 . find the principal ?
"p = 216 ( 100 / 5 ) ^ 2 = > p = 5400 answer : c"
divide(216, subtract(power(add(divide(20, const_100), const_1), 2), add(multiply(divide(20, const_100), 2), const_1)))