The Library charges a fine of 10 cents each day if you return a book late. Maura paid a fine of 80 cents. How many days late was her book?
Would you use multiplication or division to solve this problem?

Multiplication, because I need to find how many in all.
Division, because I need to find how many in all.
Division, because I need to find equal groups.
Multiplication, because I need to find equal groups.