McDonald's Earnings Rise, Stock Up  CHICAGO (Reuters) - McDonald's Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=MCD.N target=/stocks/quickinfo/fullquote"&gt;MCD.N&lt;/A&gt; third-quarter  earnings per share rose a higher-than-expected 42 percent on a  preliminary basis, the world's largest restaurant chain said on  Wednesday, citing strong sales in the United States and a lower  tax rate.