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Kelas 7 MatematikaBab Perbandingan dan Aritmatika Sosial
Bagian sisa uang ibu = 45.000
(1 - 10%) . a = 45.000
(100/100 - 10/100) . a = 45.000
90/100 . a = 45.000
a = 45.000 . 100/90
a = Rp 50.000,00
Uang yang ibu belanjakan = 10% x 50.000
Uang yang ibu belanjakan = Rp 5.000,00