In 2006 , You Earned $\$ 8.50$ Per Hour at Your Job

Short Answer

In 2006 , you earned $\$ 8.50$ per hour at your job. In 2009 , you earned $\$ 8.70$ per hour at your job. In 2010, you earned $\$ 9.30$ per hour at your job.
a) What was the average rate of change in the amount you earned per hour between 2006 and 2009 ?
b) What was the average rate of change in the amount you earned per hour between 2009 and 2010 ?
Round answers to 3 decimal places if necessary.