经济学问题关于marginal cost,边际成本

题目

经济学问题关于marginal cost,边际成本
A book company spends $6,000 per week on rent for its factory.Each book made at the factory requires $3 worth of paper and $5 worth of labour and energy.Answer the following questions assuming that the factory produces 1,500 books per week.
What is the marginal cost of a book?

答案

$3 worth of paper and $5 worth of labour and energy
3+5=8