the mall charges 60 cents for the first hour of parking and $ 4 for each additional hour until the customer reaches 4 hours , after that the parking fee is $ 2 per hour . if edward parked his car in the mall for 7 hours and 30 minutes , how much is he going to pay ?
"0.60 + 4 * 4 + 2 * 4 + 0.60 = $ 25.2 answer : $ 25.2"
add(add(multiply(4, 4), multiply(add(subtract(7, 4), divide(60, const_100)), 2)), divide(60, const_100))