How much does JK Rowling make per book?

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Tags

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2. #standard
3. #sales
4. #rowling
5. #potter
6. #billion
7. #spinoffs
8. #assuming
9. #million
10. #alone
11. #harry
12. #another
13. #adults
14. #estimates
15. #royalty
16. #earned
17. #several