On January 4, 1973 the price of a widget was $87.65. On January 4, 1986 the price of a widget was $77.66. Find the average rate of change in the price of a widget from 1973 to 1986. Round to the nearest cent.

The average rate of change is $LaTeX: \displaystyle \frac{77.66-87.65}{1986-1973}= -0.77$ dollars per year.