Kevin Company Prepared the Following Static Budget for the Year

Kevin Company prepared the following static budget for the year 2015: $$\begin{array} { | l | c | r | } \hline \text { Static Budget } & & \\\hline \text { Units/volume } & & 5,000 \\\hline& \text { Per Unit } \\ \hline \text { Sales revenue } & \$ 3.00 & \$ 15,000\\\hline \text { Variable expenses } & \$ 1.50 & 7,500\\\hline \text { Contribution margin } && 7,500 \\\hline \text { Fixed expenses } & & \underline { 4,000 }\\\hline \text { Operating income/(loss) } & &\underline {\$3,500} \\\hline\end{array}$$ If a flexible budget was prepared at a volume of 6,000, calculate the amount of operating income.

A) $5,000
B) $3,500
C) $9,000
D) $4,000