3. Periodic methods (5 points each-total 15 points) The units of an item available for sale during the year were as follows: Inventory 2,600 units at $4 Feb. 1 Purchase Mari 27 Purchase 2,900 units at $5 Aug 21 3,300 units at $6 Dec 23 Purchase 1,200 units at $7 Ending inventory -2825 units. Show all your work for full credit include units and dollar amounts 1. Determine the ending inventory dollar amount using FIFO 2. Determine the ending inventory dollar amount using LIFO 3. Determine the ending inventory dollar amount using AVERAGE COST METHOD