How much to charge for mowing 5 acres of grass?

I am almost 16 and these really rich people offered me to mow for them. I would be using their equipment and their gas, etc. I really dont know what they have, but given they have a 5 acre land id think its a pretty big zero turn. The land is a tiny bit hilly, but nothing bad at all. They have a few trees and want me to pull weeds, weed eat, and mow. What should i charge? It will probably be weekly. I just need an estimate. Probably around $60 or so? What you think? Thanks sooooo much! 10 pts.