There are 52 weeks in a year.
The employee works 80 hours every 2 weeks. This means that his weekly hours worked wll be:
[tex]\frac{80}{2}=40\text{ hours per week}[/tex]If he earns $20.50 per hour, his weekly wages will be:
[tex]\Rightarrow20.50\times40=\$820[/tex]For 52 weeks in the year, he will earn:
[tex]52\times820=\$42640[/tex]The employee's annual income is $42,640.