Sheridan Co. uses a periodic inventory system. Its records show the following for the month of May, in which 73 units were sold. Units Unit Cost Total Cost May 1 Inventory 30 $8 $240 15 Purchases 29 11 319 24 Purchases 36 12 432 Totals 95 $991 Compute the ending inventory at May 31 and cost of goods sold using the FIFO and LIFO methods. FIFO LIFO Ending inventory at May 31 Cost of goods sold