Ballas Co. uses a periodic inventory system. Its records show the following for the month of May, in which 68 units were sold. Unit Cost Units Total Cost $240 A May 1 15 24 Inventory Purchases Purchases 30 25 35 $8 11 12 275 420 Totals 90 $935 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