Three identical units of merchandise were purchased during July, as follows: Date Product T Units Cost 1 $36 July 3 Purchase 10 Purchase 24 Purchase 1 39 Total 3 $117 Average cost per unit $39 Assume one unit sells on July 28 for $55. 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 Gross Profit Cost of Goods Sold Ending Inventory a. First-In, first-out $ b. Last-In, first-out $ c. Average