A Company Completed the Following Transactions in the Order Given

A company completed the following transactions in the order given in its first year of operations: $\begin{array} { | l | l | l | } \hline \text { Transaction } & \text { Units } & \text { Unit Costs } \\\hline \text { Purchase } & 300 & \$ 4.00 \\\hline \text { Purchase } & 200 & 4.20 \\\hline \text { Sales (@ \$8.00) } & 280 & \\\hline \text { Purchase } & 400 & 4.40 \\\hline \text { Sales (@ \$8.00) } & 360 & \\\hline\end{array}$
Using the weighted-average inventory cost method (rounding each calculation to the nearest cent) the gross margin would be:

A) $2,463.78
B) $2,422.84
C) $2,433.20
D) $2,376.00