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Let's analyze the question:

You are asked to find the **average rate of change** of annual sales (in millions of dollars) for two time periods:

### a) Between 1999 and 2000
- The sales in 1999 are 142 million dollars.
- The sales in 2000 are 170 million dollars.
  
The formula for the **average rate of change** is:

\[
\text{Average rate of change} = \frac{\text{Change in sales}}{\text{Change in time}}
\]

For part (a):

\[
\text{Average rate of change} = \frac{170 - 142}{2000 - 1999} = \frac{28}{1} = 28 \ \text{million dollars per year}.
\]

### b) Between 1999 and 2001
- The sales in 1999 are 142 million dollars.
- The sales in 2001 are 190 million dollars.

For part (b):

\[
\text{Average rate of change} = \frac{190 - 142}{2001 - 1999} = \frac{48}{2} = 24 \ \text{million dollars per year}.
\]

Would you like more details on how to compute these, or do you have any questions?

Here are some related questions for further practice:

1. What is the average rate of change between 2000 and 2002?
2. What is the total increase in sales between 1998 and 2004?
3. How would the average rate of change between 2004 and 2006 compare to previous years?
4. Is the trend in sales increasing or decreasing after 2004?
5. What is the overall average rate of change from 1998 to 2006?

**Tip:** The average rate of change is essentially the slope of a line between two points on a graph, representing how much one quantity changes relative to another.

What was the average rate of change of annual sales between 1999 and 2000 and between 1999 and 2001?

This problem involves finding the average rate of change of annual sales between the years 1999 and 2001, with the data provided in millions of dollars. Learn how to apply the average rate of change formula, comparing sales from 1999 to 2000 and from 1999 to 2001. Ideal for students in Grades 8-10.

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