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10% starej ceny to ...2 zł bo 28:14 =2
stara cena to ...20.zł bo 100% =10*10%=10*2=20
10% starej ceny to 2 zł. (bo 0,1*(28:1,4)=0,1*20=2))
Stara cena to 20 zł. (bo 28:1,4=20)