What is the cost to make a whopper?

Depends on many factors. How much meat is in it? A half pound burger is going to cost a lot more than a little slider that as an ounce of meat. Is the roll specially made or is it a cheap bun? Are you going to put cheese on it? What condiments are going on the burger? Lettuce and tomato with onions and mushrooms? Or a single pickle and a splash of ketchup and mustard?