On January 4, 1978 the price of a stembolt was $49.70. On January 4, 1989 the price of a stembolt was $41.03. Find the average rate of change in the price of a stembolt from 1978 to 1989. Round to the nearest cent.

The average rate of change is $LaTeX: \displaystyle \frac{41.03-49.70}{1989-1978}= -0.79$ dollars per year.