Cost flow methods The following three identical units of Item P401C are purchased during April: Date Item Beta Units Cost Apr. 2 Purchase 1 $271 Apr. 15 Purchase 1 272 Apr. 20 Purchase 1 273 Total 3 $816 Average cost per unit ($816 3 units) $272 Assume that one unit is sold on April 27 for $389. Determine the gross profit for April and ending inventory on April 30 using the (a) first-in, first-out (FIFO); (b) last-in, first-out (LIFO); and (c) weighted average cost method