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I was in my local gaming store earlier and Wonderbook was SOLD OUT. There were a few angry Harry Potter fans there too who looked pissed off! Anyway, this got me thinking...

JK Rowlings Harry Potter movies have grossed $7.7bn worldwide. Lets say 10% of these people buy Wonderbook...

$7.7bn / 10 = $770m

$770m / $60 = ~12.8m

Wonderbook will sell 12.8m copies.