Question 1

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The table below gives the annual sales (in millions of dollars) of a product.

1998 1999

2000 2001 2002 2003 2004 2005 2006

225 279 321 351 369 375 369 351 321

year

sales

Determining the average rate of change of sales is important. It tells whether sales are increasing or

decreasing over a time period, and at what rate.

a) What was the average rate of change of annual sales between 2001 and 2002?

millions of dollars/year

b) What was the average rate of change of annual sales between 2001 and 2004?

millions of dollars/year