Find the Average Rate of Change Illustrated in the Graph

Multiple Choice

Find the average rate of change illustrated in the graph.
-From April through December, the stock price of QRS Company had a roller coaster ride. The chart below indicates the price of the stock at the beginning of each month during that period. Find the average rate of
Change in price per month between June and September. Round to the nearest cent.

$\begin{array}{l|r}\text { Month } & \text { Price } \\\hline \text { April }(x=1) & 116 \\\text { May } & 108 \\\text { June } & 87 \\\text { July } & 101 \\\text { August } & 96 \\\text { September } & 113 \\\text { October } & 92 \\\text { November } & 85 \\\text { December } & 64\end{array}$

A) $- \$ 13.00$ per month
B) $- \$ 8.67$ per month
C) $\$ 8.67$ per month
D) $\$ 13.00$ per month