Cathy Gwynn for a class project is analyzing a "Quick Shop" grocery store. The store emphasizes quick service, a limited assortment of grocery items, and higher prices. Cathy wants to see if the store hours (currently 0600 to 0100) can be changed to make the store more profitable Daily Sales in Time Period the Time Perio 0600-0700 0700-0800 0800-0900 0900-1200 1200-1500 1500-1800 1800-2100 2100-2200 2200-2300 2300-2400 2400 0100 $ 40 80 120 400 500 600 800 200 60 120 40 The cost of the groceries sold averages 70% of sales. The incremental cost to keep the store open, including the clerk's wage and other operat- ing costs, is $22 per hour. To maximize profit, when should the store be opened, and when should it be closed?