what percentage does the gym get from personal trainers

I have worked for three corporate gyms as an employee in salt lake city Utah. All gyms have there own pluses and negatives. One gym gave me 20% of the sale and then 15% of the training rate each time I train the client. Now I’m at a great gym that gives me 8% of the sale but 45% of the training rate every time I train the client. But most gyms have a level of pay based of certifications and number of total sessions trained.