For some reason all the questions I answered still came out as "No"
The urge to reply "that's what she said" is pretty high here, but I've been out of highschool a few years and that sounds vaguely misogynistic.
More to the point, I had a friend of mine recommend that you either charge people full price for computer work or you go free. No discounts unless you make a mistake. Invariably it seems no one appreciates discounted work and you end up feeling unappreciated. I thought this was good advice.