Periodic Inventory by Three Methods The units of an item available for sale during the year were as follows: Jan. 1 Inventory Feb. 17 Purchase Jul. 21 Purchase 12 units at $26 12 units at $28 15 units at $31 14 units at $31 Nov. 23 Purchase There are 12 units of the item in the physical inventory at December 31. The periodic inventory system is used. a. Determine the inventory cost by the first-in, first-out method. b. Determine the inventory cost by the last-in, first-out method. c. Determine the Inventory cost by the weighted average cost method. Round average unit cost to the two decimal places, and round your final answer to the nearest dollar.