mommies who use a nanny/babysitter

I have a good friend who we have hired to babysit out little guy when he gets here, beginning in the spring.

She will be with him from 330/4 pm until 715/730 pm one night a week (while I'm at class).

What do you ladies pay your sitters?  I'm trying to figure out the average for our state and I know it's all over the place.  When I was younger and babysat I got 10 dollars an hour per child... but I feel like this is low now-a-days, especially for someone watching a newborn/infant.

Suggestions?

TY!