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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 $34 Feb 17 Purchase 13 units at $36 Jul 21 Purchase 9 units at $38 Nov. 23 Purchase 7 units at $39 There are 13 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 whole dollar, Frequired 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