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15 million iPads sold in one year certainly impresses me, that's 5% of the US population reached ... In one year.

The iPad was sold worldwide.

How did 15 million tablets become $15 million?

No, but >$500*15M=$7.5B in less than a year with a new product in a went-nowhere-for-decades category does.

I'm going to assume the parent post wasn't edited. I swore there was a dollar sign there.