Periodic Inventory by TreMethods The units of an item available for sale during the year were as follows: Jan. 1 Inventory 1,075 units $128 Feb. 17 Purchase1,420 units $129 Jul. 21 Purchase 1,535 units @$132 Nov. 23 Purchase 1,125 units $133 There are 1,200 units of the item in the physical inventory at December 31. The periodic inventory system is used. Do not round intermediate calculation and round final answer to nearest whole value 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