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How much do billionaires give?

In June, Warren Buffett and Bill and Melinda Gates challenged the nation's billionaires to give away at least half of their net worth. Here's how 9 big spenders dole out their money.

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J.K. Rowling
J.K. Rowling
In 2010, J.K. Rowling gave $15 million to multiple sclerosis research.


NEXT: Warren Buffett
Last updated December 14 2010: 8:44 PM ET
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