Periodic inventory by three methods The units of an item available for sale during the year were as follows: Jan. 1 Inventory 2,300 units at $6 Feb. 17 Purchase 2,900 units at $8 Jul. 21 Purchase 3,300 units at $10 Nov. 23 Purchase 1,500 units at $12 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. $