(businessinsider.com): Amazon's Kindle business is about to contribute 10% of the company's overall revenue, says Citi analyst Mark Mahaney. Mahaney estimates Kindle unit sales for 2011 to be 17.5 million, which is $2.1 billion in revenue. He estimates eBook sales to be 314 million units, which is $1.7 billion. Combined that's 8% of Amazon's 2011 revenue.
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