The units of an item available for sale during the year were as follows: Jan, 1 Inventory 2,100 units at $7 Feb. 17 Purchase 3,600 units at $9 Jul. 21 Purchase 2,600 units at $11 Nov. 23 Purchase 1,700 units at $13 There are 2,000 units of the item in the physical inventory at December 31 . The periodic inventory system is used. This information has been Excel Online file. Open the spreadsheet, perform the required analysis, and input your answers in the questions below. Open spreadsheet a. Determine the inventory cost by the first-in, first-out method. b. Determine the inventory cost by the last-in, first-out method. c. Determine the inventory cost by the weighted average cost method. Round your answer to the nearest dollar