Three identical units of merchandise were purchased during July, as follows: Date Product Units Cost July 3 Purchase 1 $22.00 10 25.00 28.00 Total $75.00 Average cost per unit $25.00 Aasume one unitses on suly 28 for $36.00. Determine the gross profit, cost of merchandise sold, and ending inventory on July 31 using the (n) first in, first out. (b) last first-out, and (c) average cost flow methods. Gross Profit Cost of Merchandise Sold Ending Inventory a) First-in, first-out b) Lastin, first out c) Average