in order to ensure that its students' nutritional needs are met, a certain elementary school provides free lunch every day to its entire student body. in an attempt to cut costs, it contacted a local italian restaurant, which offered to sell pizzas to the school at a reduced rate. the school ordered and served pizzas on one day, and afterward, the school's vice principal calculated that the total cost of the pizza and delivery was slightly more than the total cost of a typical lunch day. therefore, he concluded that the school could not save money by replacing cafeteria lunches with pizza from this restaurant.