The operator of 7,500 fast-food restaurants in the U.S. and Canada is trying out delivery service at some stores in Virginia and Maryland as a way to boost sales, according to a report by Bloomberg. Burger King Holdings Inc. is offering delivery service from 11 a.m. to 10 p.m. in select stores in those states. Burger King's website says deliveries cost $2.00 and there is a minimum order of $8.00 to $10.00, depending on the market. The report says that 3G Capital Inc., a New York-based private-equity firm, bought Burger King for about $3.93 billion in 2010. It goes on to say that revenue rose 1.4% to $608.1 million in the three months ending September 30, compared with the year before.