On these websites, the author gives permission to translate his / her book to the translator, while the latter translates the book for free in return of book sales revenue. (advicesbooks.com)
In 2012, e-book sales accounted for 20 % of trade book sales revenue. (articles.latimes.com)
It's a pretty big day — You can now get 70 % of book sales revenue from Kindle Store books if you follow certain guidelines including pricing the book between $ 2.99 and $ 9.99. (dealsagar.com)