what will be the difference between simple and compound interest @ 20 % per annum on a sum of $ 500 after 2 years ?
"s . i . = 500 * 20 * 2 / 100 = $ 200 c . i . = 500 * ( 1 + 20 / 100 ) ^ 2 - 500 = $ 220 difference = 220 - 200 = $ 20 answer is b"
subtract(subtract(multiply(500, power(add(divide(20, const_100), const_1), 2)), 500), multiply(multiply(500, divide(20, const_100)), 2))