A company purchased 200 units for $30 each on January 31. It purchased 200 units for $20 each on February 28. I costing method, calculate the cost of ending inventory on December 31. (Assume that the company uses a perpetu A $140 B. $2,800 C. $4,200 D. $11,200 A company purchased 200 units for $30 each on January 31. It purchased 200 units for $20 each on February 28. I costing method, calculate the cost of ending inventory on December 31. (Assume that the company uses a perpetu A $140 B. $2,800 C. $4,200 D. $11,200