I teach 2 kids per class, usually one adult accompanies them. We decorate a dozen cupcakes and I show them a fun little rainbow swirl technique. Then we decorate a fondant covered dummy. Takes a couple of hours and I charge $120.00 but would probably say with real cake and no cupcakes I would charge $75/ each and they would leave with a really neatly decorated cake each.
One thing I will say, smaller class is better. Young ones tend to have very short attention spans and it’s hard to get them to focus.