How many books have been sold??

Let's say I get a book from the library and I like it. And let's say I want to find out how many copies of the book have been sold since it was published. How would I go about doing that? Anybody have any idea?

Thanks,
+-*/ Math_Wiz
 
Thanks Sulong. I posted my message over there, let's see if they come up with anything. :)

I posted my question under the "Writing Novels" section.

+-*/ Math_Wiz
 
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