find the compound interest on $ 1200 for 1 year at 20 % p . a . if ci is component yearly ?
"a = p ( 1 + r / 100 ) ^ t = 1200 ( 1 + 20 / 100 ) ^ 1 = 1200 * 6 / 5 = $ 1440 ci = a - p = 1440 - 1200 = $ 240 answer is c"
subtract(multiply(1200, power(add(const_1, divide(20, const_100)), 1)), 1200)