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bunga yang diterima=920.000-800.000
=120.000
%bunga=12×100×bunga:b bulan×tabungan awal
9%=12×100×120.000:b bulan×800.000
9%=144.000.000:800.000 b bulan
9%=180 b bulan
b bulan =180:9
=20
jadi lama arin menabung adalah 20 bulan