eBook Show Me How Calculator Periodic inventory by three methods; cost of goods sold The units of an item available for sale during the year were as follows: Jan. 1 Inventory 180 units at $108 Mar. 10 Purchase 224 units at $110 Purchase 200 units at $116 Dec. 12 Purchase 196 units at $120 There are 208 units of the item in the physical inventory at December 31. The periodic inventory system is used. Aug. 30 Determine the ending inventory cost and the cost of goods sold by three methods.