Personal Shopper Needed

What is a good service fee for personal grocery shopping?
I was thinking about becoming a personal grocery shopper for people who need it. I need to make some extra money on the side, and I thought maybe this was a good idea. What kind of percentage or fee do you think is fair to charge?
i wud suggest 10% of the total amount spent for shopping as ur service fee and u can charge actual expenses for transportation…
Personal Stylist and Image Consultant Denver