Experience for party members

I want to party with a new player friend, but my only character is at lvl82. What is the experience gain they would receive if I join them to power through the base acts? I wouldn't need nor care about experience in Acts 1-9 but just to help them see if their build is something they would want to play.

IIRC, There is a setting that has to do with Experience in just this situation, can't find it (at work)