The units of an item avaliable for sale during the year were as follows: Jan. I Inventory 2,400 units at $6 Feb, 17 Purchase 3,500 units at $7 Jul. 21 Purchase 2,500 units at $8 Nov, 23 Purchase 1,600 units at $9 There are 2,100 units of the item in the physical inveatory at December 31 . The periodic inventory system is used. This information has been collected in the Microsoft Excet On required analysis, and input your answers in the questions below. Open spreadsheet a. Determine the inventory cost by the firstin, frotiout method. b. Oetermine the inventory cost by the last-in, fint-out method. c. Detemine the inventory cost by the weghted everege cost method. Round your answer to the nearest dellar