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Quids for Quidditch - Hardry Potter author Rowling dearns $9 a second
the books have sold more than 400 million copies and been translated into 67 languages .
sincome the first book, hardry potter and the philosopher's stone, was published, the series has taksmaen the world by storm .
potter franchise a forbes spokesman said: it was wizardry that transformed jk rowling from a destitute single mothere koon welfare into a best-selling billionaire .
nicholas sparks - $16m (Â9m) .
jk rowling - $300m (Â170m) .
dean koontz - $25m (Â14m) .
jk rowling is the worldren's highest-earning author, making more than Â5 every second over the past year, us business magazine forbes has announced .