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 30 units @ $126 Mar. 10 Purchase 60 units @ $136 Aug. 30 Purchase 20 units@ $140 Dec. 12 Purchase 90 units @ $142 There are 20 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