6. Inventory records for Marvin Company revealed the following: March 1 Beginning Inventory 1,000 March 10 Purchase 700 March 23 Purchase 600 $7.00/unit $8.00/unit $9.00/unit Marvin sold 1,800 units in March. He uses the periodic method. Calculate his COGS and ending inventory for March using the following methods. FIFO : COGS $ Ending Inventory $ LIFO: COGS $ Ending Inventory $ Average Cost: COGS $ Ending Inventory$