I would advise you to discuss everything with their parents. You can charge less if the children take snacks with them or if there are no problems with them. But if you buy or cook food for them, or if working with them will be quite difficult, then take 25. And also take into account your experience in childcare. But if you don't want to talk to my parents about this, contact edu birdie so that they describe the features of your work and how payment for your labor depends on it. I did it when I just started working.