A company purchased 300 units for $30 each on January 31. It purchased 360 units for $36 each on February 28. Its uses the first -in, first-out (FIFO) inventory costing method? (Assume that the company uses a perpetual inventory s O A. $1,350 OB. $7,560 O c. $6,300 OD. $4,950 February 28 It sold a total of 450 units for $45 each from March 1 through December 31. What is the cost of ending inventory on December 31 if the company petual inventory system.)