The Income Statement for Sapphire Manufacturing Company for 2018 Is

The income statement for Sapphire Manufacturing Company for 2018 is as follows: $\begin{array}{lr}\text { Sales (20,000 units) } & \$ 150,000 \\\text { Variable expenses } & 50,000\\\text { Contribution margin } & \$ 100,000 \\\text { Fixed expenses } & 30,000\\\text { Operating income } & \$ 70,000\end{array}$
If sales increase by 2,000 units, what will happen to profit?

A) Profit will increase by $13,000.
B) Profit will increase by $10,000.
C) Profit will decrease by $15,000.
D) Profit will decrease by $18,000.