Periodic Inventory Using FIFO, LIFO, and Weighted Average Cost Methods The units of an item available for sale during the year were as follows: Jan. 1 Aug. 7 Dec. 11 Inventory Purchase Purchase 6 units at $37 $222 20 units at $39 780) 13 units at $40 520 39 units $1,522 There are 19 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). a. First-in, first-out (FIFO) b. Last-in, first-out (LIFO) c. Weighted average cost