Oh, my math was ok--but my reading was not. I misinterpreted the 12,000,000 as belonging to McDonald's. Just as of troy noted, the 12 mil were for restaurants at large, and that makes sense. And it makes sense that one in twenty-five would work at some restaurant.

So, I do apologize for misterpreting that reading.

(Math: 12,000,000 divided into the 300,000,000 population would be 25, or 1 in 25 (as I mentally calculated) employed by restaurants, not surprising at all; but 1 in 25 employed by McDonald's is what I thought when first reading the information.)