Solve the Problem $5.0 \%$ an Investment with a Risk Factor of 13 Has

Solve the problem.
-The rate of return of certain investments increases as the risk factor of the investment increases. An investment with a risk factor of 2 has a rate of return of $5.0 \%$ . An investment with a risk factor of 13 has a rate of return of $14.0 \%$ . What is the average rate of return per unit of risk?

A) $0.67 \%$ per unit risk
B) $1.22 \%$ per unit risk
C) $0.82 \%$ per unit risk
D) $1.50 \%$ per unit risk