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Uang Bidin :
Rp 9.000 × 5 = Rp 45.000
Uang Susi :
Rp 9.000 × 8 = Rp 72.000
Jumlah uang Bidin dan Susi :
Rp 45.000 + Rp 72.000 = Rp 117.000
= (5+8)/(8-5) x 27.000
= 13/3 x 27.000
= 117.000