Periodic Inventory Using FIFO, LIFO, and Weighted Average Cost Methods The units of an item available for sale during the year were as follows: There are 17 units of the item in the physical inventoly 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 (UFO) 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). Fetdoace check My wor 8. When the fifo method is used, costs are included in cost of merchandise sold in the order in which they were purchased. b. When the clifo method is used, the cost of the units sold is the cost of the most recent purchases. c. The average cost method is sometimes called the weighted average method. The average cost method uses the averape unit cast