M7-8 (Algo) Calculating Cost of Goods Available for Sale, Ending Inventory, Sales, Cost of Goods Sol and Gross Profit under Periodic LIFO [LO 7.3] Required: a. Calculate cost of goods avaliable for sale and ending imventory under UFO. Assume a periodic inventory system is used. b. Calculate sales, cost of goods sold, and gross profit, under LIFO. Assume a periodic inventory system is used. Complete this question by entering your answers in the tabs below. Calculate sales, cost of goods sold, and gross profit, undet LifO. Assume a periodic inventory system is used