That's pretty low. Check references and make sure they are pretty recent. My wife has been a nanny for several families and we also did it out of our home until we had our second. The last child she watched was about a year old and it was 200 for about 40 hours. The parents provided most of the food, diapers etc.
Also make sure the person is willing to provide their ss# so you can claim the costs on your taxes.