Babysitter questions!!

So I am a babysitter and a mother to a 18 month old. I watch an almost 3 year old and I believe a 16 month old. I watch them for about 30-40 hours a week. They pay me 360 on the 1st and 15th. Do you think that is enough? I don’t feed them meals but am considering it since all they bring are snacky foods or macaroni and cheese everyday for lunch and or the same thing for “breakfast” while my son gets a variety of foods for his meals...so they always want what each other has. Also, I only have one high chair that I use for my son...but the younger one is too small to sit at the table but if I were to switch my son I know he would move all around too. Should I ask their parents to provide a high chair? I always have them sit at the table for snacks or meals to avoid house messes. I’ve worked at a daycare before so I kind of have an idea.

**ive also just started watching them since late May so not a long time. As I start to figure things out.