[Tutor] going rate for python tutoring?

[Benjamin Fishbein]

Hello,
I'm trying to learn "posting" and am having a very hard time at it. I'm going to hire someone to give me a private lesson, so I put up a notice on Northwestern's CS bulletin board--probably a student there'll be able to help.
How much money should I offer? I haven't the foggiest notion what the going rate is for private computer tutoring.
Thanks,
Ben