Three identical units of merchandise were purchased during July, as follows: Units Cost July 3 Purchase 1 $36 10 Purchase 1 39 24 Purchase 1 42 Total 3 $117 Average cost per unit $39 Assume one unit sells on July 28 for $55. Determine the gross profit, cost of merchandise sold, and ending inventory on July 31 using the (a) first-in, first-out, (b) last-in, first-out, and (c) weighted average cost flow methods. a. First-in, first-out b. Last-in, first-out c. Weighted average cost Gross Profit Cost of Merchandise Sold Ending Inventory