Given the Following Information, Use the LIFO Method to Calculate

Given the following information, use the LIFO method to calculate the value of the inventory at the end of the month. $\begin{array} {ll}\text {Beginning Inventory} &\text {40 cases @ \$20/case}\\\text {Purchases}&20 cases@\text {\$22/case}\\\text {Ending Inventory }&\text {30 cases}\\\end{array}$

A) $600
B) $620
C) $640
D) $660