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Statistika
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2015 = 180° - (60° + 90°) = 30°
maka,
2017 = 360° - (70° + 60° + 30° + 90°)
2017 = 110°
•••
Banyak siswa 2017:
= 110/30 × 60
= 220 Orang
Jawaban: C.