Periodic Inventory by Three Methods The units of an item available for sale during the year were as follows: 18 units at $39 Jan. 1 Inventory Feb. 17 Purchase 6 units at $40 Jul. 21 Purchase 16 units at $42 Nov. 23 Purchase 18 units at $43 There are 17 units of the item in the physical inventory at December 31. The periodic inventor answers to the nearest whole dollar, if required. a. Determine the inventory cost by the first-in, first-out method. $ 768 X b. Determine the inventory cost by the last-in, first-out method. 702 X c. Determine the inventory cost by the weighted average cost method. 42.41 X