On January 4, 1959 the price of a stembolt was $6.84. On January 4, 1990 the price of a stembolt was $93.43. Find the average rate of change in the price of a stembolt from 1959 to 1990. Round to the nearest cent.

The average rate of change is $LaTeX: \displaystyle \frac{93.43-6.84}{1990-1959}= 2.79$ dollars per year.