Joe's Products Co. had the following purchase transaction during the first quarter of its fiscal year: keer Date Transaction Jan. 1 Jan. 15 Beg. Inv. Purchase Number Per of Units Unit $15 100 Feb. 15 Purchase 120 March 15 Purhcase Joe's Products sold 170 units at $30/unit during the quarter. Of the untis sold, 20 came from beginning inventory, 30 came from the Feb. 25 purchase, and 50 came form the March 15 purchase with the remaining units coming from Jan. 15. Fill out the table below with the COGS, Ending Inventory, and Gross Margin under the four different inventory flow assumptions: Specific First-In, Last-In, Weighted Identification First-Out First-Out Average Cost Cost of Goods Sold 3,440 2,970 3,890 Ending Inventory 3.180 4,100 Gross Margin 1,660