Profit at EBay Up Sharply, Stock Rises &lt;p&gt;\&lt;/p&gt;&lt;p&gt; By Lisa Baertlein&lt;/p&gt;&lt;p&gt; SAN FRANCISCO (Reuters) - EBay Inc., the world's largest\online marketplace, on Wednesday posted a 77 percent increase\in quarterly profit, fueled by strong back-to-school shopping\and growth in its international and PayPal businesses.&lt;/p&gt;