Base draw + % commission

[freshnesschronic]

Lets just fudge these numbers:

Say commission is $30,000 base salary.
The draw is $2,500 monthly. This means that I'm given a check for $2,500

So say in one month I sell $30,000 worth of sales, 15% of that is $4,500. So do I subtract the $2,500 from that $4,500, so is my commission for the month $2,000? On top of my weekly base salary paycheck?