Periodic Inventory by Three Methods The units of an item availabie for sale during the year were as follows 5 units at $25 Jan. 1 Inventory Feb. 17 Purchase 4 units at $26 Jul. 21 Purchase Nov. 23 Purchase 6 units at $29 17 units at $30 There are 10 units of the item in the physical inventory at December 31. The periodic inventory system is used. Round average unit cost to two decimals and final answers to the nearest whole dollar, if required. a. Determine the inventory cost by the first-in, first-out method 597 X b. Determine the inventory cost by the last-in, first-out method. 50 X c. Determine the inventory cost by the weighted average cost method. 300 x