Printem Periodic Inventory by Three Methods The units of an item available for sale during the year were as follows: Jan. 1 Inventory 12 units at $36 Feb. 17 Purchase 18 units at $38 Jul. 21 Purchase 16 units at $41 Nov. 23 Purchase 6 units at $42 There are 31 units of the item in the physical Inventory at December 31. The periodic inventory system is used. Round average unit cost to one decimal and final answe to the nearest whole dollar, if required. a. Determine the inventory cost by the first-in, first-out method. b. Determine the inventory cost by the last-in, first-out method min c. Determine the inventory cost by the weighted average cost method