answer:A percentage is a difficult thing to arrive at for several reasons. The owner’s overhead, including but not limited to, other product, location, insurance, advertising, employee expenses, equipment. You are coming in with a flavor of the week. You will have to ‘haggle’...even though you might not want to…simply because of the nature of the proposition. Of what are you entitled to make a percentage? Only on the ice cream of the week? Is the owner prepared to keep track of it? I’d be interested in the follow up, should you decide to do this. And, I wouldn’t post your recipes…just not a good business move. Good luck.