When I watched a neighbor's child, the parents offered 50.00 a day and I accepted. The child was 6 months old when I began watching her and I had the priveledge of having her for 3 + years. The 50.00 included: 8 1/2 hour day (sometimes longer if the mom had a meeting at work), and as the child grew, I was eventually responsible for supplying lunch and snacks. If the parent was late picking up the child, then I was responsible for dinner as well. The parents did want me to begin library classes with the child, but I declined due to cost of gas. This was when our gas prices started rising sky high. No additional money was offered and I never did get a raise (which was ok but I felt at some point if I kept adding food and activities out of pocket that I was actually taking a pay reduction and I felt that I provide much for $50.00)
I was also a caregiver that spent lots of time playing outdoors, going for walks and engaging the child in other activites (not just sitting in front of the TV. The child had a designated toy section filled with books, puzzles, music etc. all supplied by me), all age appropriate according to the child's growth, remember I had her for 3 + years. All in all, I felt I provided much for the price paid.
Take into considertion the going price in your area, what you are willing to offer in terms of environment for the child, and that the price I am quoting was from 4 years ago.