help please

Periodic inventory by three methods The beginning inventory at Midnight Supplies and data on purchases and sales for a three-month period ending March 31 are as follows: 1. Determine the inventory on March 31 and the cost of goods sold for the three-month period, using the first-in, first-out method and the periodic inventory system. Inventory, March 31 Cost of goods sold \$ 2. Determine the inventory on March 31 and the cost of goods sold for the three-month period, using the last-in, first-out method and the periodic inventory system. Inventory, March 31 : Cost of goods sold \$ Inventory, March 31 Cost of goods sold \$ Inventory, March 31 : Cost of goods sold $ 4. Compare the gross profit and the March 31 inventories, using the following column headings. For those boxes in which you must enter subtracted or negative numbers use a minus sign