Accurate sales figures are not public knowledge.
there are 7 summaries. one in each book.
None, all the Harry Potter books have been released.
There are approximately 554 owl in all the books of harry potter
There are six prefects in each house, two for each year.
By 2008 over 400 million Harry Potter books were sold.
Nothing because Deathly Hallows was the last Harry Potter book and Voldemorts dead and stuff. But if there is book about Percy Jackson and Harry Potter meet each other. That will be awesome!!
Harry Potter digital audio books are available from many places, with Amazon being the most popular. On average each of the audio books cost about $10.
There are seven Harry Potter books. They were all written by the same author and all belong in the same genre.
934,768 harry potter books are sold monthly the most ever sold daily is about 2,075
Many people who read Harry Potter books find it quite addictive, yes.
All seven books.
No, other than three additional books J.K Rowling wrote that were mentioned in the series there are only seven. There are books on the Wizarding world, but none are to do with Harry Potter.