None. I scored 200 points higher on my SAT than our class valedictorian In all fairness though, she was a paper pusher, not a savant.

Here's a quote from the linked article:

Mr Buffett said that he was taxed at 17.7 per cent on the $46 million he made last year, without trying to avoid paying higher taxes, while his secretary, who earned $60,000, was taxed at 30 per cent.

http://www.timesonline.co.uk/tol/money/tax/article1996735.ece