Campbell Soup Co. Profit Falls 20 Percent  CHICAGO (Reuters) - Campbell Soup Co. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=CPB.N target=/stocks/quickinfo/fullquote"&gt;CPB.N&lt;/A&gt;, the world's  largest soupmaker, on Monday said quarterly net profit fell 20  percent as it increased spending on marketing and took a charge  related to job cuts.