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bunga pertahun = 9/100 . 800.000 = 72.000
bunga perbulan = 72.000/12 = 6.000
lama kaka menabung = 120.000/6.000 = 20 bulan
b/12.9/100.800.000 = 920.000 - 800.000
6000b = 120.000
b=20
jadi, kakak menabung selama 20 bulan