On January 4, 1989 the price of a widget was $36.59. On January 4, 2015 the price of a widget was $18.50. Find the average rate of change in the price of a widget from 1989 to 2015. Round to the nearest cent.

The average rate of change is $LaTeX: \displaystyle \frac{18.50-36.59}{2015-1989}= -0.70$ dollars per year.