A company purchased 300 units for $30 each on January 31. It purchased 400units for $20 each on February 28. It sold a total of 460 units for $100 each from March 1 through December 31. If the company uses the lastin, firstout inventory costing method, calculate the cost of ending inventory on December 31. (Assume that the company uses a perpetual inventory system.)

A.$4,800

B.$16,800

C.$7,200

D.$240