A Study Found That the Divorce Rate D (Given as a Percentage)

Multiple Choice

A study found that the divorce rate d (given as a percentage) appears to depend on the ratio r of available men to available women. This function can be approximated by $$d ( r ) = \left\{ \begin{array} { l l } - 40 r + 100 & \text { if } r \leq 1.3 \\\frac { 101 r } { 4 } - \frac { 118 } { 4 } & \text { if } r > 1.3\end{array} \right.$$
There are currently 0.8 available men per available woman in Littleville, and this ratio is increasing by 0.1 per year. At what percent is the divorce rate decreasing

A) 0.4% per year
B) 0.08% per year
C) 10% per year
D) 4% per year
E) 10.1% per year