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Pulpen=25%Buku tulis =40%
penggaris =15%
pensil =25%+40%+15%=80
25% ⇒ 20
80% ⇒ x
80/25 X 20=d. 32
pensil = 100% - ( 40%+15%+25% )
= 100% - 80%
= 20 %
jumlah pensil terjual = 20/25 x 20 lusin =16 lusin
jawab .b.16 lusin
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