Periodic Inventory by Three Methods The units of an item available for sale during the year were as follows: Jan. 1 Inventory 14 units $25 Feb. 17 Purchase 19 units $27 July 21 Purchase 6 units O 129 Nov. 23 Purchase 20 units 530 There are 14 units of the item in the phywcal inventory at December 31. The periodic inventory system is used a. Determine the inventory cost by the first-in, firstout method b. Determine the inventory cost by the last in 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