5. Ford Co. uses a periodic inventory system. Its records show the following for the month of May, in which 75 units were sold. Units Unit Cost Total Cost May 1 Inventory 35 $ 8 $ 280 15 Purchases 30 12 360 24 Purchases 40 13 520 Totals $1,160 105 Instructions Compute the ending inventory at May 31 and cost of goods sold using the FIFO, LIFO and Average Cost methods. Prove the amount allocated to cost of goods sold under each method