no, it would only be an additional $40 if you had another adult and even then it would reflect in the estimated total. If you want to confirm this, go to their site and play around with the rates. 2 Adults and 1 kid will always be $40 less than 3 adults.
Okay, thanks, that makes sense. I had played around with the number of kids in the room and wasn't seeing a difference, but didn't even think to adjust the number of adults. (DOH!) When I play around with the number of adults, it does adjust by $40 each... Thanks for getting me through my brain freeze.