Bayer to Pay Fine for Rubber Price Fixing  WASHINGTON (Reuters) - Germany's Bayer AG &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=BAYG.DE target=/stocks/quickinfo/fullquote"&gt;BAYG.DE&lt;/A&gt; has  agreed to plead guilty and pay a \$4.7 million fine for taking  part in a conspiracy to fix the prices of synthetic rubber, the  U.S. Justice Department said on Wednesday.