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Kelas 7 MatematikaBab Perbandingan dan Aritmatika Sosial
Jumlah tabungan = 280.000
tabungan awal + bunga = 280.000
250.000 + (250.000 . 18/100 . a/12) = 280.000
3.750 a = 280.000 - 250.000
a = 30.000 / 3.750
a = 8
Maka, lama Ani menabung adalah 8 bulan