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Harga setelah didiskon 10% = 13.500
Buat persamaannya :
6g - (10% × 6g) = 13500
6g - (0,1 × 6g) = 13500
6g - 0,6 g = 13500
5,4g = 13500
g = 13500/5,4
g = 13500 × 10/54
g = 2500
Jadi harga 1 gelas sebelum didiskon Rp2500,-
Harga awal sebelum diskon = 15000
jadi harga 1 gelas sebelum diskon
= 15000 : 6
= 2500