On January 4, 1971 the price of a stembolt was $15.39. On January 4, 1999 the price of a stembolt was $83.45. Find the average rate of change in the price of a stembolt from 1971 to 1999. Round to the nearest cent.

The average rate of change is $LaTeX: \displaystyle \frac{83.45-15.39}{1999-1971}= 2.43$ dollars per year.