Assume that three identical units of merchandise were purchased during October, as follows: Units Cost October 5 Purchase 1 $5 12 Purchase 1 13 28 Purchase 1 15 Total 3 $33 Assume one unit is sold on October 31 for $28. Determine cost of goods sold, gross profit, and ending inventory under the average cost method. October 31 Sales $fill in the blank 1 Cost of Goods Sold fill in the blank 2 Gross Profit $fill in the blank 3 Ending Inventory $fill in the blank 4