Periodic Inventory by Three Methods ; Cost of Merchandise Sold The units of an item available for sale during the year were as follows: Jan. 1 Inventory 50 units @ $90 Mar. 10 Purchase 70 units @ $102 Aug. 30 Purchase 30 units @ $108 Dec. 12 Purchase 50 units @ $112 There are 60 units of the item in the physical inventory at December 31. The periodic inventory system is used . Determine the inventory cost and the cost of merchandise sold by three methods . Round interim calculations to one decimal and final answers to the nearest whole dollar.