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pertahunnya = 1.920.000/3 = 640.000 / tahun
bunga = 8.000.000 * x/100 = 80.000x
jadi jumlah bunga per tahun :
8.000.000 + 80.000x = 8.640.000
80.000x = 8.640.000 - 8.000.000
80.000x = 640.000
x = 640.000 / 80.000 = 8
jadi jumlah bunga pertahun ialah 8 %