On January 4, 1984 the price of a widget was $9.99. On January 4, 2007 the price of a widget was $13.85. Find the average rate of change in the price of a widget from 1984 to 2007. Round to the nearest cent.

The average rate of change is $LaTeX: \displaystyle \frac{13.85-9.99}{2007-1984}= 0.17$ dollars per year.