A company purchased 500 units for $20 each on January 31, it purchased 550 units for $22 each on February 28 it sold a total of 660 units for $10 each from March 1 through December 31 What is the cost of ending inventory on December 31 if the company uses the first-in, first-out (FIFO) inventory costing method (Assume that the company uses a porpotual inventory system) O A $8,580 OB. $2,880 OC. $7,800 OD. $4,920