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25%=125% =1,25 cena garnka
1,25-95%*1,25 =1,25-1,1875 =0,0625 cena kubka
1-0,0625 =0,9375 różnica cen (plecak-kubek)
100%*0,9375/0,0625 =100%*15 =1500%
plecak droższy od kubka o 1500%