Periodic Inventory Using FIFO, LIFO, and Weighted Average Cost Methods The units of an item available for sale during the year were as follows: whole dollar). a. First-in, first-out (FIFO) $ b. Last-in, first-out (LIFO) $ c. Weighted average cost $ Periodic Inventory Using FIFO, LIFO, and Weighted Average Cost Methods The units of an item available for sale during the year were as follows: whole dollar). a. First-in, first-out (FIFO) $ b. Last-in, first-out (LIFO) $ c. Weighted average cost $