# If a company earned $100,000 in 1980 and $400,000 in 2010, what was its average rate of change per year?

##### 1 Answer

Sep 28, 2014

The **average rate of change is the slope** of the secant line or just line that intersects

If you think of the information as coordinates on a graph the points would be

**Average rate of change =**

**The average rate of change per year is $10000.**