Three identical units of merchandise were purchased during July, as follows: Date Product Basic H Units Cost July 3 Purchase $35 1 Purchase 10 1 36 Purchase 24 1 37 $108 Total 3 $36 Average cost per unit Assume one unit sells on July 28 for $45 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 Gross Profit Ending Inventory a. First-in, first-out $1 b. Last-in, first-out $ c. Average $