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 50 units at $122 Mar. 10 Purchase 70 units at $130 Aug. 30 Purchase 30 units at $136 Dec. 12 Purchase 50 units at $142 There are 60 units of the item in the physical inventory at December 31. The periodic inventory system is used. Determine the ending inventory cost and the cost of goods sold by three methods. Round interim calculations to one decima to the nearest whole dollar.