if albert ’ s monthly earnings rise by 20 % , he would earn $ 560 . if , instead , his earnings rise by only 21 % , how much ( in $ ) would he earn this month ?
"= 560 / 1.2 ∗ 1.21 = 564 = 564 answer is d"
multiply(divide(560, add(const_1, divide(20, const_100))), add(const_1, divide(21, const_100)))