As far as rates go, it’s pretty simple. I charge $80 for the first hour of labor and $40 for each hour after that. Most jobs tend to cost around $80 if it’s simple simple like a computer speedup. If it’s something more complex like virus removal, then you are typically looking at paying around $160. If you have hardware problems as well and new parts need to be purchased that would be added into the cost of labor as well.
But just so you know, I really try to keep prices reasonable and I won’t go and do mean things like charge you for lunch breaks and such.