The units of an item available for sale during the year were as follows: Jan. 1 Inventory 850 units at $ 43 Mar. 10 Purchase 1090 units at $ 46 Aug. 30 Purchase 902 units at $ 49 Dec. 12 Purchase 870 units at $ 55 There are 950 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 the following three methods, presenting your answers in the following form: Cost of Merchandise Merchandise Inventory method Inventory Sold a. First-in, first-out $ $ b. Last-in, first-out c. Weighted average cost Show your calculations