15. Inventory records for Marvin Company revealed the following: March 1 Beginning Inventory March 10 Purchase March 16 Purchase March 23 Purchase 1,000 600 800 600 $8.00/unit $8.25/unit $9.50/unit $9.75/unit Marvin sold 2,300 units during the month. Marvin keeps his records on a periodic inventory basis. Calculate his COGS and ending inventory using FIFO: COGS $ Ending Inventory S Average Cost COGS Ending Inventory S