It also should be noted that a business that is capital-intensive will often absorb wage increases much easier than a firm that is much more labor-intensive. With that said, I have no idea if McDonald's is more capital-intensive or more labor-intensive.
That would make labor 2/3 the cost of a burger.
I'll have to admit that I don't eat at MickeyD's for the same 5.40 I can make a meal and eat leftover for at least a day.
And it's better food with less environmental impact.
If you really think MickeyD's is an issue don't got there.