92 people prefer horror.
Explaination: 200 people, and %s are always out of 100. For 200, you can just multiply the number by two to find how many people.
Here's the other ones just in case you need these:
Horror: 92 people
Comedy: 30 people
Mystery: 20 people
Science fiction: 58 people
To make sure you have the right answer, add up all the people to see if you get 200. If you get 200 (I checked, and I did) then you have the right answer.