The answer to this question must follow the rules from the Federal Trade Commission, if we do not document the sales annually in the FDD we can verbalize it. Then we can talk about the three elements to a percentage level: Food Cost, Labor Cost & Rent Cost. With this, do your own protections having in consideration the prices, average transaction fees, hours of operation, etc.
Food cost of 25% to 330%.
Labor cost not higher of 15% to 18%.
No rent higher than 3% to 5%.