Concord Co, uses a periodic inventory system. Its records show the following for the month of May, in which 72 units were sold. Unit Units Cost Total Cost May 1 Inventory 37 $11 $407 15 Purchases 350 24 Purchases 480 $1237 Totals Compute the ending inventory at May 31 and cost of goods sold using the FIFO and LIFO methods. FIFO LIFO Ending inventory at May 31$ Cost of goods sold