a small publishing company is planning to publish a new book. the production costs will include one-time fixed costs (such as editing) and variable costs (such as printing). there are two production methods it could use. with one method, the one-time fixed costs will total , and the variable costs will be per book. with the other method, the one-time fixed costs will total , and the variable costs will be per book. for how many books produced will the costs from the two methods be the same?