Favorite Music Type Survey

In a recent survey of 120 students conducted at a local high school, students were asked about their favorite type of music. The responses were categorized as follows:

• Pop: 30 students
• Rock: 45 students
• Hip-Hop: 25 students
• Classical: 20 students

Based on this data set:

Let $x$ represent the percentage of students who prefer Rock music.

What is the value of $x$?