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920.000 - 800.000 = 120.000
maka 120.000/72.000 = 5/3 tahun atau 5/3 x 12 = 20 bulan
12 100
120.000 = 800.000 x w x 9
12 100
120.000 = w x 6000
w = 120.000 : 6000
w = 20 bulan