am making a 2 tier cake and I was wondering if 8in and 10in well feed 50 people were also making cupcakes for all the kids. so the little kids well be eating cupcakes.

Round or Square?
An 8" round serves 24 and an 10" round serves 39.
An 8" square serves 32 and a 10" square serves 50.

CC'r metria has this awsome cakulator on her blog. It's very helpful when trying to figure out servings.

http://shinymetalobjects.net/cake/calculator/test/cakulator.html

Wow, that is an awesome link! Thanks!