Bramble Inc. uses a perpetual inventory system. Its records show the following for the month of May. Date Explanation Units May 1 Inventory 33 May 15 Purchase 25 May 18 Sale (45) May 24 Purchase 42 Total 55 (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 $ +A $ +A