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 23 units at $1,800 Purchase 30 units at $1,950 May 15 Aug. 7 Purchase 12 units at $2,040 Nov. 20 Purchase 17 units at $2,100 There are 20 units of the item in the physical inventory at December 31. Determine the cost of ending inventory and the cost of goods sold by three methods, presenting your answers in the following form: