On January 4, 1975 the price of a stembolt was $38.68. On January 4, 1990 the price of a stembolt was $8.14. Find the average rate of change in the price of a stembolt from 1975 to 1990. Round to the nearest cent.

The average rate of change is $LaTeX: \displaystyle \frac{8.14-38.68}{1990-1975}= -2.04$ dollars per year.