How much should I charge for babysitting per kid?
What are your qualifications ? How much experience do you have ? Do you have a driver's license ?and a car ? What is the going rate in your are ? Do you know CPR and First aid? There's many things that factor into your asking price.
How long? How crappy are the kids?
If you're minimum of age 16, licensed to drive, have your CPR/First Aid certification, and have experience as a mother's helper, start at $10 per hour for the first child.
Kids are assholes. Therefore I suggest $500.