Sheridan 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 34 $12 $408 15 Purchases 25 15 375 24 Purchases 38 16 608 Totals 97 $1.391 Compute the ending inventory at May 31 and cost of goods sold using the FIFO and LIFO methods. Ending inventory at May 31 Cost of goods sold FIFO $ $ LIFO