AAA Co. uses a periodic inventory system and has the following information in regard to its inventory:

Beginning inventory	200 units @ 15	$3,000
Purchase on January 25	300 units @ 16	4,800
Purchase on March 15	200 units @ 17	3,400
Purchase on October 2	400 units @ 18	7,200
Goods available for sale		$18,400

There are 500 units in ending inventory. What is the amount of the ending inventory using the FIFO method?

A) $8,900

B) $3,000

C) $7,200

D) $7,800