Hmm - Would you be having the kids for 12 hours a day as well.... the going rate here in my town is $75 to $100 per child per week from 6 am to 6pm (some 7 pm).... so to me the $200 a week sounds reasonable, per my towns charge.
Not for sure if any of the INFO helped you or not.... but its all I got to offer.... I am watching my 10 month old great niece for my niece for the summer at $50 a week (family discount).
LoVe,
Rhapsody -