I helped you with a previous problem that was almost exactly the same as this one. Did you take notes on the previous problem so that you would have some reference to help you do later problems?
Briefly, Total Pay = $100 + 0.13(total of sales)
= $100 + 0.13($6050) = ?
This is a linear relationship. Initial value was $100 and commissions are 13% of the total of sales.