Periodic Inventory by Three Methods The units of an item available for sale during the year were as follows: an. 1 Inventory1,055 units $138 Feb. 17 Purchase 1,400 units @ $139 Jul. 21 Purchase 1,515 units@ $142 Nov. 23 Purchase 1,125 units @ $142 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. 170,400 b. Determine the inventory cost by the last-in, first-out method. 125,435 X c. Determine the inventory cost by the weighted average cost method. 168,300 X