The Following Data Pertain to Activity and Costs for Two

Multiple Choice

The following data pertain to activity and costs for two recent months: $$\begin{array} { | l | l | l | } \hline & \text { October } & \text { November } \\\hline \text { Activity level in units } & 5,000 & 10,000 \\\hline & & \\\hline \text { Variable costs } & \$ 10,000 & ? \\\hline \text { Fixed costs } & 30,000 & ? \\\hline \text { Mixed costs } & 20,000 & ? \\\hline \text { Total costs } & \underline { \$ 60,000 } & \$ 75,000 \\\hline\end{array}$$ Assuming that these activity levels are within the relevant range, the mixed costs for November were?

A) $25,000.
B) $30,000.
C) $20,000.
D) $40,000.