On January 4, 1950 the price of a widget was $54.84. On January 4, 1971 the price of a widget was $7.38. Find the average rate of change in the price of a widget from 1950 to 1971. Round to the nearest cent.

The average rate of change is LaTeX:  \displaystyle \frac{7.38-54.84}{1971-1950}= -2.26 dollars per year.