PR7-4A Periodic inventory by three methods three-month period are shown in Problem 7-1A. Instructions OBJ. 2, 3 The beginning inventory for Midnight Supplies and data on purchases and sales for a 1. Determine the inventory on March 31 and the cost of merchandise sold for the three- em. month period, using the first-in, first-out method and the periodic inventory syst 2. Determine the inventory on March 31 and the cost of merchandise sold for the three- month period, using the last-in, first-out method and the periodic inventory syste 3. Determine the inventory on March 31 and the cost of merchandise sold for the three- month period, using the weighted average cost method and the periodic inventory system. Round the weighted average unit cost to the nearest cent. 4. Compare the gross profit and the March 31 inventories, using the following column headings: FIFO LIFO Weighted Average Sales Cost of merchandise sold Gross profit Inventory, March 31