7. RJ Corporation has provided the following information about one of its inventory items: Date Transaction Number of Units Cost per Unit Beginning Inventory 6/6 Purchase 9/10 Purchase 11/15 Purchase 400 800 1,200 800 ,200 $3,600 4,000 4,200 During the year, RJ sold 3,000 units. What was ending inventory using the LIFO cost flow assumption under a periodic inventory system? O $640,000 O $880.000. O $840000 O $770,000