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10% starej ceny to 84zł : 7 = 12zł
100% starej ceny to 12zł*10 = 120zł
stara cena to 120zł
100%-30%=70
70%=84zl
84zl:7=12zl - 10% starej ceny
84zl:70=1,2zl
1,2zl*100=120zl - stara cena