The following lots of a particular commodity were available for sale during the year Beginning inventory 10 units at $51 First purchase 15 units at $50 Second purchase 28 units at $20 Third purchase 16 units at $57 The firm uses the periodic system, and there are 24 units of the commodity on hand at the end of the year. What is the ending inventory balance at the end of the year rounded to nearest dollar according to the average cost method? Do not round Intermediate calculations. Oa, 5050 Ob 51.972 Oc. 51,210 Od 51.224