Beth is looking at her book collection and is wondering how many comic books she owns. She has 120 books and 65% are novels. 18 are graphic novels. The rest are comic books. What percentage of comic books does she own?
Find the solution. 
The proportion of graphic novels is .15 because 18 / 120 = .15
The percentage of graphic novels is 15 because 100 x .15 = 15
The percentage of comic books is 20 because 100 - 65 - 15 = 20