DuPont Posts Profit, Sees Slower Growth  NEW YORK (Reuters) - DuPont Co. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=DD.N target=/stocks/quickinfo/fullquote"&gt;DD.N&lt;/A&gt; posted a quarterly  profit on Tuesday but warned that high energy prices will  dampen global economic growth for the rest of the year.