The following lots of a particular commodity were available for sale during the year Beginning inventory First purchase 9 units at $48 15 units at $50 Second purchase Third purchase 27 units at $22 15 units at $57 The firm uses the periodic system, and there are 25 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. $997 Ob. $1,232 Oc. $1,200 Od. $1,075