Dollar Tree Inc. agreed to buy Family Dollar Stores Inc. (FDO) for at enterprise value of $9.2 billion to enlarge the discount retailer’s network to more than 13,000 stores with annual sales exceeding $18 billion. In a transaction approved by the boards of both companies, Dollar Tree (DLTR) is offering $74.50 a share, a premium of almost 23 percent to Family Dollar’s closing price on July 25.Source