Find the Average Rate of Change of the Function From x

Multiple Choice

Find the average rate of change of the function from $$x _ { 1 } \text { to } x _ { 2 }$$
-From April through December 2000, 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 monthly average rate of change in price between June and September. $\begin{array}{l|r}\text { Month } & \text { Price } \\\hline \text { April }(x=1) & 115 \\\text { May } & 109 \\\text { June } & 88 \\\text { July } & 99 \\\text { August } & 96 \\\text { September } & 112 \\\text { October } & 92 \\\text { November } & 84 \\\text { December } & 64\end{array}$

A) $\$ 8.00$ per month
B) $- \$ 8.00$ per month
C) $\$ 12.00$ per month
D) $- \$ 12.00$ per month