Required: a. Calculate cost of goods available for sale and ending inventory under FIFO. Assume a periodic inventory system is used. b. Calculate sales, cost of goods sold, and gross profit, under FIFO. Assume a periodic inventory system is used. Complete this question by entering your answers in the tabs below. Calculate cost of goods avallable for sale and ending inventory under FIFO. Assume a periodic inventory system is used. Required: 3. Calculate cost of goods available for sale and ending inventory under FIFO. Assume a periodic inventory system is used. . Calculate sales, cost of goods sold, and gross profit, under FIFO. 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, under FIFO. Assume a periodic inventory system is used