Sales and Average Operating Assets for Company P and Company

Multiple Choice

Sales and average operating assets for Company P and Company Q are given below:
$\begin{array}{|l|r|r|}\hline & \text { Sales Average } & \text { Operating Assets } \\\hline \text { Company P } & \$ 20,000 & \$ 8,000 \\\hline \text { Company Q } & \$ 50,000 & \$ 10,000 \\\hline\end{array}$
What is the margin that each company (Company P and Company Q,respectively) will have to earn in order to generate a return on investment of 20%?

A) 2.5% and 5%.
B) 8% and 4%.
C) 12% and 16%.
D) 50% and 100%.