Price? First aid kit?

[Chickpea]

What should my babysitting price be?

I came up with $15 an hour. Plus $5 each extra child.
What if i am expected to do some light chores, then what?

Also is this good enough, would you settle to these prices if you were the mom/dad?

(family of 3 children)so, babysitting for 2 hours would be $30 plus $10 for 2 extra children =$40.
-------------------------------------------------------------------------------------- ok, i bought a first aid kit for my babysitting jobs, it has 6 clensing wipes, 4 antibiotic ointments, an assortment of 39 band aids(adhesive), 8 gauze pads, 6 butterfly closures band aids, 4 tylonol(extra strenghth), 2 Motrin caplets, 1 cortaid advanced 12-hour itch cream, 1 organized carrying case!
(the tylonal is for 12 and up, so i cant give this.)

Is this all i need? i am going to babysit children 3-9 years old.