Periodic Inventory by Three Methods The units of an item available for sale during the year were as follows: Jan. 1 Inventory 14 units at $28 Feb. 17 Purchase 10 units at 529 Jul 21 Purchase 12 units at $30 Nov. 23 Purchase 6 units at $32 There are units of the items in the physical inventory at December 31. The periodic inventory system is used. Round gent cost to the eartcent and finalwers to the nearest whole dollar, frequed. a. Determine the inventory cost by the first test-out method. b. Determine the inventory cost by the last in, fost out method. c. Determine the wentory cost by the weighted average cost method