10% How much are COGS and ending inventory under the average method?
able[[Date, Explanation, Units, Unit Costs], [Jan. 1, Beginning Inventory, 100, $10], [Apr. 15, Purchase, 100, $12], [Aug. 24, Purchase, 200, $13], [Nov. 27, Purchase, 300, $15], [Dec. 31, Ending Inventory, 400]]