Fourth Quarter Highlights   Sales increased 10.8% to $2.48 billion and Same-Store Sales improved 5.6% Diluted EPS, including acquisition-related costs, decreased 2.0% to $1.00 Excluding acquisition-related costs, diluted EPS increased 13.7% to $1.16   CHESAPEAKE, Va., 2015-2-24 — /EPR Retail News/ — Dollar Tree, Inc. (NASDAQ: DLTR), North America's leading operator of discount variety stores selling everything for…