YORK, Pa.--(BUSINESS WIRE)--The Bon-Ton Stores, Inc. (NASDAQ: BONT) today reported operating results for the second quarter of fiscal 2015, the 13-week period ended August 1, 2015. Second Quarter Overview Comparable store sales decreased 1.3% in the second quarter as compared with the prior year period. Gross margin rate increased 24 basis points to 36.8% of net sales in the current year period. Selling, general and administrative expense (“SG&A”) decreased $0.6 million in the second quarte