Percentage of Students Preferring Cookies

In a recent survey conducted at a middle school, students were asked about their favorite snack. The results were represented in a bar graph where:

- 40 students preferred pizza.

- 25 students preferred nachos.

- 30 students liked cookies.

- 20 students chose chips.

- 15 students voted for fruit.

Based on the bar graph data, what percentage of the students preferred cookies as their favorite snack?