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"Tim Cook has just announced that over 50 billion apps have been downloaded from the App Store. The store now has over 900,000 apps, with 375,000 of those apps iPad-only. Currently there are over 575 million iTunes accounts. Cook has also announced that over $10 billion has been paid out to developers -- $5 billion of that within the last 12 months. That's three times more than all other platforms combined."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2013/06/10/50-billion-apps-downloaded-10-billion-paid-to-devs/>