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8 buku = Rp X
(Rp 7200 / Rp X) = (6 buku/8 buku)
kali silang
X = (7200/6) x 8
= 1200 x 8
= Rp 9600
8 buku=?
6=7.200,00
1=7.200,00÷6=1.200,00
8 buku= 1.200,00×8=Rp 9.600,00
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