McDonald's warns that weak sales will hit fourth-quarter profit

By Lisa Baertlein (Reuters) - McDonald's Corp on Monday reported a steeper-than-expected drop in global sales at established restaurants in November, hurt by weakness in the United States and Asia, and warned that such results would "significantly pressure" margins in the current quarter. November marked the sixth straight month of worldwide same-restaurant sales declines at McDonald's, which is battling changing consumer tastes, tough U.S. competition, the after-effects of a