That depends on what book you borrow. The older the book, the more money will be deducted. This is calculated according to the time you have exceeded. Generally speaking, there is not much deduction. You borrowed books from our classmates for two months and only paid a few dollars. You have to pay at the library center in the library lobby, and you must bring a campus service card. But if it's a book in the old district, you have to pay in the library in the old district.