Toyota Doubles Prius Hybrid Cars for U.S.  DETROIT (Reuters) - Toyota Motor Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=7203.T target=/stocks/quickinfo/fullquote"&gt;7203.T&lt;/A&gt; said on  Thursday it will double the number of Prius hybrid-electric  cars that it sends to the U.S. market to 100,000 units annually  next year, making it the Japanese automaker's third  best-selling sedan.