a present value of a machine is $ 2000 . its value depletiation rate is 20 % per annum then find the machine value before 2 years ?
"p = $ 2000 r = 20 % t = 2 years machine value before 2 years = p / [ ( 1 - r / 100 ) ^ t ] = 2000 * 5 / 4 * 5 / 4 = $ 3125 answer is a"
multiply(2000, power(subtract(const_1, divide(20, const_100)), 2))