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A/C= 3/1
A:C= 3:1
A= 3/4 B
A/B=3/4
A:B = 3:4
B:A:C
4:3:1
Jumlah perbandingan
= 4+3+1
= 8
Uang Banu
= 4/8 × 72.000
= Rp36.000