42 100 polints AAA Co. uses a periodic inventory system and has the following information in regard to its inventory 400 units15 500 units16 $6,000 8,000 6,800 Purchase on January 25 Purchase on March 15400 units17 Purchase on October 2 Goods available for sale 600 units18 $31600 There are 700 units in ending inventory. What is the amount of the ending inventory using the FIFO method? $6,000 O $10,800 O $14,000 O $12.500