Please take a look at http://www.wharton.upenn.edu/mba/admissions/cost-summary.cfm for more information about the cost of education for one year. You can expect that the cost of education for next year will likely be the same or a bit higher than that for 2010-2011.
You may have to look at multiple options, including those outside of Wharton, to see if there are scholarship or loan options to cover the full fees or personal expenses. Wharton-backed options can be investigated by visiting http://www.wharton.upenn.edu/mba/admissions/financing-your-mba.cfm.
I'd suspect that it is rare for students to get a complete scholarship. MBA candidates often have work experience, and I suspect many need-based loaners would note that most candidates will likely have some income available that they would have to contribute towards their MBA programs. Each individual has different circumstances, however. Good luck on your due diligence finding out what works best for you.
PS - I also like to think of the process as one "similar" to that of undertaking an entrepreneurial venture: loaners/backers/funders might want to see that you are willing to invest in yourself, too, before they also "invest" in you.