Sheffield Co. uses a periodic inventory system. Its records show the following for the month of May, in which 76 units were sold. Unit Cost $12 15 Total Cost $396 May 1 15 Units 33 29 36 Inventory Purchases Purchases 435 24 16 576 Totals 98 $1,407 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 $ $