other than gas, a gas station sells on average 12 coffees for $1.25 ea

other than gas, a gas station sells on average 12 coffees for $1.25 each, 3 candy bars for 90 cents each, and other products worth $15 every hour. If the gas station has 30 customers an hour and each customer purchases exactly one item, what are its average sales, excluding gas, per customer? (...)