Dallas, Convenience store retailer 7-Eleven said its third-quarter profit rose 55% on strong merchandise and gasoline sales. For the quarter ended Sept. 30, net income rose to $68.3 million, or 53? per share, from $44.2 million, or 36? per share, a year earlier. Revenue for the quarter rose 17% to $3.8 billion, with merchandise sales up 6.7% to $2.26 billion, and gasoline sales up 38% to $1.51 billion.