Your price will depend on your cost, what do you expect to spend on ingredients for the cake, how long will it take you to prep/bake/decorate/clean for this order, and how much overhead do you have (insurance, license fees, etc.)?
Also, the picture you posted is copyrighted, so if you haven't done so already you would need to get permission from the copyright owner before you can copy it on a cake.
Thanks! I do know it is copyrighted...I am not copying it exact..just the idea of having a book on the cake. Thanks again. : )