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 1,800 units at $108 Mar. 10 Purchase 2,240 units at $110 Aug. 30 Purchase 2,000 units at $116 Dec. 12 Purchase 1,960 units at $120 There are 2,000 units of the item in the physical inventory at December 31. The periodic inventory system is used. Determine the inventory cost and the cost of merchandise sold by three methods.