The owner of Restaurant is disappointed because the restaurant has been averaging 6000 pizza sales per month, but the restaurant and wait staff can make and serve 7500 pizzas per month. The variable cost (for example, ingredients) of each pizza is 1.40 . Monthly fixed costs (for example, depreciation, property taxes, business license, and manager's salary) are per month 9000. The owner wants cost information about different volumes so that he can make some operating decisions.