if x is 20 percent greater than 40 , then x =
"x is 20 % greater than 40 means x is 1.2 times 40 ( in other words 40 + 20 / 100 * 40 = 1.2 * 40 ) therefore , x = 1.2 * 40 = 48 answer : a"
add(40, multiply(divide(20, const_100), 40))