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jadi lama menabung = 6 bulan
80000=2000000×n/12×8/100
80000=20000×n/12×8
80000=20000×n/3×2
20000×n/3×2=80000
n/3×2=80000/20000=4
n/3=4/2
n/3=2
n=2×3=6
jadi,lama ali menabung 6bulan