Waterproof Roofing Company Has Provided the Following Information Which of the Following Statements Is True,if the Sales Volume

Waterproof Roofing Company has provided the following information: $$\begin{array} { | l | r | } \hline \text { Sales revenue } & \$ 779,000 \\\hline \text { Variable costs } & 506,000 \\\hline \text { Fixed costs } & 216,000 \\\hline\end{array}$$ Which of the following statements is true,if the sales volume increases by 10%?

A) Operating income will increase by $50,600.
B) Operating income will increase by $27,300.
C) Fixed expenses will increase by $21,600.
D) Contribution margin will increase by $77,900.