Teachers and trainers, what do you charge to teach for someone else?

[Chasing the dream job]

Hi

I have been approached by a woman who runs sports specific courses and she's asking me to teach beauty courses on her premesis. I know what I would charge for running courses in my salon but I don't know what to charge running beauty courses for someone else on their premises.

I'm meeting her tomorrow to discuss things, she'd be filling the course, I'd be there to teach and I'd be issuing the certificates. Would you charge a day rate or a fee we student?

I was possibly thinking ½ day rate of £150 for a short course like spray tan or £200 for full day?

Any help or advice greatly appreciated!

Thanks