find the compound interest on $ 800 for 1 year at 10 % p . a . if ci is component yearly ?
"a = p ( 1 + r / 100 ) ^ t = 800 ( 1 + 10 / 100 ) ^ 1 = 800 * 21 / 20 = $ 840 ci = a - p = 840 - 800 = $ 40 answer is a"
subtract(multiply(800, power(add(const_1, divide(10, const_100)), 1)), 800)