please help me figure this out . would the answer be C?

is Question: 1 pt 25 of 50 (25 complete) This Test: 50 pts possible company purchased 200 units for $30 each on January 31. It purchased 240 units for $36 each on February 28. It sold a total of 350 units for $40 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 what the company uses a perpetual inventory system.) O A. $2,100 OB. $600 O C. $2,700 OD. $3,240