a car dealership has 40 cars on the lot , 20 % of which are silver . if the dealership receives a new shipment of 80 cars , 50 % of which are not silver , what percentage of total number of cars are silver ?
"the number of silver cars is 0.2 * 40 + 0.5 * 80 = 48 the percentage of cars which are silver is 48 / 120 = 40 % the answer is c ."
multiply(divide(add(multiply(40, divide(20, const_100)), multiply(80, divide(50, const_100))), add(40, 80)), const_100)