Double-Coupon Day at K mart: K mart,...

Double-Coupon Day at K mart: K mart, the nation’s second-largest retailer, hoping to rejuvenate sluggish sales that brought a 22% slump in profits during the first quarter, is borrowing a marketing tactic more common among supermarkets: a double-coupon day today at all of its 2,200 discount stores. “It will be a one-time only thing this year,” said Mike Wellman, vice president of marketing.