Cost Row Methods Three identical units of Item PX2T are purchased during July, as shown below. Assume that one unit is sold on July 31 for $215 Determine the gross profit for July and ending inventory on July 31 using the (a) first-in, first-out (FIFO); (b) last-in, first-out (LIFO); and (c) weighted average cost methods. a. First-in, first-out (FIFO) b. Last-in, first-out (LIFO) c. weighted average cost