Childcare cost?

A neighbor asked me to watch her kids in the daytime, for about 9 hours. When I asked her what she thought was fair pay she told me she used to pay her babysitter $30/day, which basically breaks down to $3.75/hr for both kids. I think that's insane so I have no idea how to even respond. Do you think that's fair pay, or is that insane?!

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