Gordon Company has the following data available: Transaction Beginning Inventory March 1 Purchase April 25 Sale June 10 Purchase July 20 Sale October 30 Purchase December 15 Sale Units Purchased Unit Cost Units Sold 300 $20 230 $12 300 320 $14 240 380 $15 370 If Gordon Company uses a perpetual FIFO inventory system, the cost of ending inventory on December 31 is OA. $13,650 OB. $4,800 OC. $18,200 OD. $6,400