On January 4, 1970 the price of a sprocket was $71.50. On January 4, 1992 the price of a sprocket was $8.77. Find the average rate of change in the price of a sprocket from 1970 to 1992. Round to the nearest cent.

The average rate of change is $LaTeX: \displaystyle \frac{8.77-71.50}{1992-1970}= -2.85$ dollars per year.