Walgreen Qtrly Profit Rises 30.5 Pct  CHICAGO (Reuters) - Walgreen Co. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=WAG.N target=/stocks/quickinfo/fullquote"&gt;WAG.N&lt;/A&gt; on Monday posted a  30.5 percent rise in quarterly profit, boosted by sales of  generic drugs and digital photo processing, sending its shares  to a nearly three-year high.