So this is for a friend of a friend -
Is this to be machine sewn front and back? (or back and front?)
Or machine sewn to the front and hand sewn to the back?
I don't know what is fair - because it takes me a long time to do the job.
Depending on what part of the country you live in - the "allowable rate" may vary. I think you should ask for at least minimum wage for your time .