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Cika = C ... Melin = m
C : M = 4 : 7
M = 63.000
Mx = 63.000...> misal x sebagai variabel perbandingan
7x = 63.000
x = 9.000
melin ... 4 x 9.000 = 36.000
a . m + C = 63.000 + 36.000 = Rp 99.000
b . M - c = 63.000 - 36.000 = Rp 27.000
c. M(melin) = Rp 63.000
C(cika) = Rp 36.000