Joseph borrowed a book from a library. The library charged a fixed rental for the book and a late fee for every day the book was overdue. The expression below shows the charges Joseph paid for the book when he returned it x days after the due date:
2 + 0.25x
What does the coefficient of the expression represent?
The fixed rental for the book
The total late fee for the book
The late fee per day for the book
The number of days the book was overdue
is it d