It will depend on what is included in the rent.
I rented a room once at only 10%, that included rent, water, heat, lighting, phone, reception duties etc.
I also rented a table in a salon to do nails and paid 40% commision and got the same deal as above.
Anywhere upto 60% is paid. But again it would depend what you get. If they provide all your products, advertising, bills etc then anything up to 60% is usual.
If you are providing your own stuff then up to 40% should be expected.
Always negotiate and try and get the best deal for you. If its a really busy salon than you may be happier to pay more, than you would if its a new salon or a quiet one.
Hope this helps sorry if its not so specific.
Kate x