[rhc2104]

That makes sense for a full-time in-person school that costs a lot of money.

But Udacity's part-time remote program is $299 a month, https://www.udacity.com/nanodegrees/nd009 so charging by percentages is less worthwhile.

[j_h_s]

You could charge something like a quarter percent for only a few months as a placement fee, and keep the standard $200 rate for all classes, with placement services as an option. While that's not as attractive as a full refund, it does avoid the issues pointed out in some of the other comments (like counting a freelance job as employment).