A company purchased 500 units for $30 each on January 31. It purchased 600 units for $36 each on February 28. It sold a total of 650 units for 540 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 perpetual inventory system) O A. $12,900 OB. $600 OC. $13,500 OD $16.200