On January 4, 1979 the price of a widget was $71.13. On January 4, 2002 the price of a widget was $21.57. Find the average rate of change in the price of a widget from 1979 to 2002. Round to the nearest cent.

The average rate of change is $LaTeX: \displaystyle \frac{21.57-71.13}{2002-1979}= -2.15$ dollars per year.