Three identical units of merchandise were purchased during July, as follows! Date Product T Units Cost July 3 Purchase. 1 $34 10 Purchases 37 24 Purchase 1 40 Total 3 $111 $37 Average cost per unit t Assume one unit sells on July 28 for $52. Determine the gross profit, cost of goods sold, and ending inventory on July 31 using (a) first-in, first-out, (b) last-in, first-out, and (c) average cost flow methods. Cost of Goods Sold Ending Inventory Gross Profit a. First-in, first-out b. Last-in, first-out c. Average