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90/450*100%=0,2=20%
540-0,2*540=540-108=432
450-432/450*100%=18/450*100%=1800/450=180/45=20/5=4%
cena po podwyżce 540
cena podwyższona o 540-450=90
90/450*100% =20%
540*20/100= 108
540-108=432
powinno być dobrze ;)