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Microsoft founder and billionaire philanthropist Bill Gates says the rich should pay more taxes. The world's richest man has had a busy day in Canberra, lobbying Prime Minister Julia Gillard to stay committed to foreign aid, meeting the Opposition Leader and speaking at the National Press Club. He has told the ABC's 7.30 he has paid more than $US6 billion in taxes and he is glad to have done it. "In order to deal with all the medical cost demands and other challenges in the US, as we look to raise that revenue, the rich will have to pay slightly more. That's quite clear," he said.