babysitter question

Chelsea • Mommy to Connor after 3 years of infertility, 2 rounds of IVF, the loss of our son Colt and another angel baby.
I plan on asking a good friend to watch our baby two days a week once I go back to work.  She is a stay at home mom to a one year old.  I would be supplying all food and diapers for our baby.  What is a fair price to pay her per day?? I have NO experience in this at all besides knowing I got $30 a day like 10 years ago!