AAA Co. uses a periodic inventory system and has the following information in regard to its inventory: Beginning inventory Purchase on January 25 Purchase on March 15 Purchase on October 2 Goods available for sale 200 units a 18 300 units a 19 200 units a 20 400 units @ 21 $ 3,600 5,700 4,000 8,400 $21,700 There are 500 units in ending inventory. What is the amount of the ending inventory using the FIFO method? Multiple Choice $3,600 $9,300 $8,400 $10,400