Periodic Inventory by Three Methods: Cost of Merchandise Sold The units of an item available for sale during the year were as follows: Jan. 1 Inventory 50 units $125 50 units $138 Mar. 10 Purchase Purchase 70 units $143 Purchase Aug 30 30 units $144 Dec 12 There are 80 units of the item in the physical inventory at December 31. The periodic Inventory system is used Determine the invertory cost and the cost of merchandise sold by three methods. Round interim calculations to one decimal and final answers to the nearest whole dollar. Cost of Merchandise Inventory and cost of Merchandise Sold Inventory Method Merchandise Inventory Merchandise Sold a. First-in, first-out (FIFO) b. Last-in, first-out (LIFO) c. Weighted average cost