Swifty Corporation uses a periodic inventory system. Its records show the following for the month of May, in which 72 units were sold May 1 15 24 Inventory Purchases Purchases Totals Units 33 28 39 100 Unit Cost $10 13 14 Total Cost $330 364 546 $1.240 Compute the ending inventory at May 31 and cost of goods sold using the FIFO, LIFO, and average-cost methods. (Round per unit cost to 3 decimal places, eg, 15.647 and final answers to decimal places, e.g. 5,125.) FIFO LIFO Average-cost $ Ending inventory at May 31 $ $ $ $ $ Cost of goods sold