Windspring Spas,Inc Calculate the Contribution Margin for August

Windspring Spas,Inc.reports the following information for August: $$\begin{array} { | l | r | } \hline \text { Sales Revenue } & \$ 780,000 \\\hline \text { Variable Costs } & 150,000 \\\hline \text { Fixed Costs } & 80,000 \\\hline\end{array}$$ Calculate the contribution margin for August.

A) $70,000
B) $630,000
C) $550,000
D) $700,000