There are 240 students in Grade 6, including 50 in class 6 (1), 60 in class 6 (2), 20.8% in class 6 (1), and the center angle of fan-shaped circle in class 6 (2) []

There are 240 students in Grade 6, including 50 in class 6 (1), 60 in class 6 (2), 20.8% in class 6 (1), and the center angle of fan-shaped circle in class 6 (2) []

20.8%÷50×60×360
=24.96%×360
=89.856 (degrees)