eBook Periodic Inventory by Three Methods The units of an item available for sale during the year were as follows: Jan. 1 Inventory 16 units at $36 Feb. 17 Purchase 14 units at $38 Jul 21 Purchase 19 units at $39 Nov. 23 Purchase 17 units at $40 There are 16 units of the item in the physical inventory at December 31. The periodic Inventory system is used. Round average unit cost to the nearest cent and final answers to the nearest wholt dollar, it required a. Determine the inventory coit by the first-out method 281 X b. Determine the inventory cost by the last stout method 281 x c. Determine the inventory cout by the weighted average cost method 230 X