Periodic inventory by three methods; cost of goods sold The units of an item available for sale during the year were as follows: 30 units at $90 Jan. 1 Mar. 10 Aug. 30 Inventory Purchase 50 units at $98 Purchase 20 units at $104 Dec. 12 Purchase 100 units at $108 There are 40 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 decimal and final answers to the nearest whole dollar. Cost of Ending Inventory and Cost of Goods Sold Inventory Method Ending Inventory Cost of Goods Sold First-in, first-out (FIFO) $ Last-in, first-out (LIFO) Weighted average cost