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<-> 280.000 - 250.000 = 45.000t
<-> 30.000 = 45.000
<-> t = 30.000 : 15\ 45.000 :15
<-> t = 2/3
<-> 2/3 × 12 bulan
<-> 8 bulan
penjelasan
: sama dengan PERBANDINGAN
/ sama dengan PER