Number Of Books Purchased On Kindle

During the recent quarterly earnings announcement, Amazon chief Jeff Bezos announced that several million Kindles have been sold till date.  The precise number of Kindle ereaders sold is not known and is estimated to be around 3 million.

Amazon has also not revealed the exact number of online book sales via Kindle. But here is a riddle they want you to solve:

For ‘paid’ books available in both ebook and paper format, Amazon has sold 6 Kindle ebooks for every 10 physical books sold. With free ebooks downloaded, the number of books sold on Kindle is even higher.

This is the closest we will come to know regarding the number of ebooks sold on Kindle