Swifty Inc. uses a perpetual inventory system. Its records show the following for the month of May. Unit Total Date Explanation Units Cost Cost May 1 Inventory 29 $8 $232 May 15 Purchase 24 9216 May 18 Sale (45) May 24 Purchase 36 10 360 Total 44 $808 (a) Calculate the cost of goods sold for May and the ending inventory at May 31 using the FIFO formula. Cost of goods sold $ Ending Inventory $ eTextbook and Media