For this case we can make the following rule of three:
100% -----------------> $ 1,580.00
20% -------------------> x
From here, we clear the value of x.
We have then:
[tex]x = \frac {20} {100} 1580\\x = 316[/tex]
From here, you get the amount that Earl earns in commissions.
Answer:
the amount of his paycheck is $ 316
