Periodic Inventory Using FIFO, LIFO, and Weighted Average Cost Method. The units of an item available for sale during the year wer as follows: e 12 units at $39 $468 Jan. 1 Inventory 15 units at $41 Purchase Aug. 13 615 10 units at $42 Purchase Nov. 30 420 37 units $1,503 Available for sale There are 17 units of the item in the physical inventory at December 31. The periodic inventory system is used. Determine the inventory cost using (a) the first-in, first-out (FIFO) method; (b) the last-in, first-out (LIFO) method; and (c) the weighted average cost method (round per-unit cost to two decimal places and your final answer to the nearest whole dollar) First-in, first-out (FIFO) a. b. Last-in, first-out (LIFO) Weighted average cost C