Babysitting rates

What's a good per hour rate for babysitting? I had a friend tell me she did $5 an hour per kid and when a lady messaged me and asked my rate I told her $5 an hour and she got really crappy? I'm cpr certified and a stay at home mommy so I can do a really good job. Is she expecting $2-$3 an hour? That's like  $15 a day and I'd be making no money. What do you babysitters out there charge?