3 Father Dominic’s Pizza Parlor receives 30 calls per hour for delivery of pizza. It costs Father Dominic’s $10 to send out a truck to deliver pizzas. It is estimated that each minute a customer spends waiting for a pizza costs the pizza parlor 20¢ in lost future business.

a How often should Father Dominic’s send out a truck?

b What would be the answer if a truck could only carry five pizzas?