Reasonable for babysitting ?

So my moms boyfriends son asked me to babysit his 3 kids and asked how much I would charge him. I told him $10 a day per child. I’ll have them for 10 days making $30 a day so $300 for 2 weeks. My question is does that seem too high? I’m providing food. They will be staying some nights at my house where they gets baths and clothes washed but is it too much money?

Add: I also have 2 kids of my own so I’ll be having 5 kids all together. Making 3 meals a day plus snacks, washing clothes, them taking baths, staying the night. Pretty much everything my kids do they are included