Home Depot and Lowe's are the two largest home improvement retailers in the U.S. The following table shows the total revenue (in billions) for each retailer for the years 2008-2010.

Source: Annual Reports of Home Depot, Inc., and Lowe's Companies Inc.

Year Home Depot Lowe's

2008.....................$77.35............................$48.28

2009.......................71.29..............................48.23

2010.......................66.18..............................47.22

a. Calculate the growth rate for 2008-2009 and 2009-2010 for each retailer.

b. Calculate the average growth rate for each retailer.