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Ditanya = majalah?
Soal = 4000 eksemplar
Majalah = 100% - 23% - 25% - 40%
= 12%
Cara
= Ditanya/Diketahui x soal
= Majalah/Semua x 4000 eksemplar
= 12/100 x 4000 eksemplar
= 480 eksemplar
Jawab = A