Percentage of billings and superannuation

I have managed to negotiate a percentage of 50% billings, but my practice is taking super out of that percentage. Is this allowed?

Superannuation not being paid

My practice isn’t paying me any superannuation, what do I do?

The NTCER and superannuation

Regarding a statement in the NTCER Schedule A Remuneration, I don’t understand how superannuation works in practice because 44.79% + 10.0% does not equal 49.27%.