CHICAGO — Burger King franchisees sued the hamburger company this week over its $1 double cheeseburger promotion, saying they're losing money on the deal and the company can't set maximum menu prices. The National Franchise Association, a group that represents more than 80 percent of Burger King's U.S. franchise owners, said the $1 promotion forces restaurant owners to sell the quarter-pound burger with at least a 10-cent loss. While costs vary by location, the $1 double cheeseburger typically costs franchisees at least $1.10, said Dan Fitzpatrick, a Burger King franchisee from South Bend, Ind. who is a spokesman for the...