<image>A school plans to purchase a batch of extracurricular reading materials. To understand students' preferences for extracurricular reading, the school conducted a survey titled "My Favorite Extracurricular Reading." The survey included four categories: "Literature," "Popular Science," "Art," and "Others." Each student had to choose one and only one category. The school randomly selected some students' survey forms from the entire student population for statistical purposes and depicted the results in the two incomplete statistical charts as shown in the image. The central angle of the sector representing "Art" books in the pie chart is ______ degrees.
