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maka harga mula = harga beli + diskon
= Rp.90.000 + Rp.9000 = Rp. 99.000
persentase setelah diskon = 100%-10% = 90%
harga jual = 90% x harga semula
90000 = 90/100 x harga semula
harga semula = 90000 x 100/90
harga semula = 100000