In all fairness, when I was an undergrad long ago I earned beer money doing various photography-related jobs for the alumni association and other such groups for not a lot of money. But, today, $100 to go somewhere, spend 4 hours doing something you otherwise probably aren't interested in doing, and probably spend the rest of the day editing? $100 for basically a day really isn't great money unless there were some reason you wanted to do the job and the money was just a little something extra.

Do yourself a favor and spend a few of those hours researching how much you can reasonably charge for programming work.