On January 4, 1978 the price of a sprocket was $55.18. On January 4, 2010 the price of a sprocket was $80.84. Find the average rate of change in the price of a sprocket from 1978 to 2010. Round to the nearest cent.

The average rate of change is $LaTeX: \displaystyle \frac{80.84-55.18}{2010-1978}= 0.80$ dollars per year.