Periodic Inventory by Three Methods The units of an item available for sale during the year were as follows: Jan, 1 Inventory 9 units @ $28 Feb. 17 Purchase 19 units $30 July 21 Purchase 19 units $33 Nov 23 Purchase 18 units $35 There are 9 units of the item in the physical inventory at December 31. The periodic Tnventory system is used a. Determine the inventory cost by the first in first-out method b. Determine the inventory cost by the taster, first-out method. c. Determine the inventory cost by the weighted average cost method. Round average unit cost to the nearest cent and final answers to the nearest whole dollar, if required