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 30 units at $108 Mar 10 Purchase 40 units at $116 Aug. 30 Purchase 20 units at $122 Dec. 12 Purchase 110 units at $126 There are 10 units of the item in the physical eventory at December 31. The periodic inventory system is used Determine the ending invertory cost and the cost of goods sold by three methods. Round interim calculations to ona 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 Pirtist-out (FFO) Lasti, first-out (LIFO) Wighted average cout