Periodic Inventory by Three Methods The units of an item available for sale during the year were as follows: Jan. 1 Inventory 10 units at $43 Feb. 17 Purchase 17 units at $45 Jul 21 Purchase 9 units at $48 Nov. 23 Purchase 18 units at $50 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 two decimals and final answers 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 c. Determine the inventory cost by the welghted average cost method