From April through December 2000, the stock price of QRS Company had a roller coaster ride. The chart below indicates th e price of the stock at the beginning of each month during that period. Find the monthly average rate of change in price between May and August.
Month. Price
April (x = 1). 114
May 107
June 89
July 100
August 95
September 110
October 93
November 85
December 65