the population of a town is 15000 . it decreases annually at the rate of 20 % p . a . what will be its population after 2 years ?
15000 × 80 / 100 × 80 / 100 = 9600 answer : d
subtract(subtract(15000, multiply(15000, divide(20, const_100))), multiply(subtract(15000, multiply(15000, divide(20, const_100))), divide(20, const_100)))