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banyaknya=persen×totalnya
a. Banyak yg suka bulutangkis= 20%×40 = 8
b. Banyak yg suka tinju = 20%×40=8
c. yg suka spak bola+tenis= total seluruh siswa-(yg suka bulutangkis+yg suka tinju) = 40-(8+8) = 40-16=24
(koreksi dulu jika salah)