if x > 0 , x / 40 + x / 20 is what percent of x ?
"just plug and chug . since the question asks for percents , pick 100 . ( but any number will do . ) 100 / 40 + 100 / 20 = 2.5 + 5 = 7.5 7.5 is 75 % of 100 = e"
multiply(add(divide(const_1, 40), divide(const_1, 20)), const_100)