<p><a href="http://www.nytimes.com/2006/09/07/education/07educ.html%5B/url%5D">http://www.nytimes.com/2006/09/07/education/07educ.html</a> </p>
<p>"On average, a year at a public four-year university costs 31 percent of a familys income, the report said. But that figure hides the enormous difference between families in the bottom 20 percent of income, for which it would be 73 percent of annual income, and those in the top 20 percent, for which it would amount to only 9 percent."</p>