Out of the 300 comic books in a comic store, 30% are liked by females, males like 120, and both genders don't like the rest. What percentage of the comic books are disliked by both males and females? Think carefully first, then make a decision:
The number of comic books that females like is 30 / 100 * 300 = 90 books. Together, both males and females like 90 + 120 = 210 comic books. The number of comic books that are disliked by both males and females is 300 - 210 = 90. The percentage of books that are disliked by both genders is 90 / 300 * 100 = 30%. So, the answer is 30.