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1,1x - cena po podwyzce 10 %
1,1x - 0,05*1,1x - cena koncowa =
1,045x
odp. o 4,5%
1.1x-5%*1.1x=1.1x-0.055x=1.045x
x-1.045=-0.045
Cena koncowa jest wyzsza o 4.5%