a company purchased 200 units for $40 each on January 31st it purchased 200 units for $30 each on February 28th it sold a total of 250 units for $100 each from March 1st through December 31st if the company uses the last in first out inventory costing method calculate the cost of ending inventory on December 31st (assume that the company uses a perpetual inventory system)

O A. $9,000 O B. $6.000 O C. $4,500 O D. $150