This is dependent on the cost of the book, the percentage of the royalty, and the publishing costs. For instance, if a book costs $20 with a 10% royalty, then this means that the author makes $2 per sale, which would imply that he/she needs to sell about 50,000 books to make $100,000. Given that there are many children's book publishers Canada, with different contractual arrangements and royalty schemes, the authors should first estimate how much money they will make.