RJ Corporation Has Provided the Following Information About One of Their

RJ Corporation has provided the following information about one of their inventory items:

$$\begin{array}{ll}\begin{array} { ll } \text { Date } & \text { Transaction } \\1 / 1 & \text { Beginning Inventory } \\6 /6& \text { Purchase } \\9 / 10 & \text { Purchase } \\11/ 15 & \text { Purchase }\end{array}\begin{array} { l l} \text { Number of Units } & \text { Cost per Unit } \\400& \$ 3,200 \\800 & \$ 3,600 \\1,200 & \$ 4,000 \\800 & \$ 4,200\end{array}\end{array}$$
During the year,3,000 units were sold. What was ending inventory using the average cost flow assumption?

A) $640,000
B) $840,000
C) $770,000
D) $880,000