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90/ 450 = 20%
540 * 80% = 432
450 - 432= 18
18/450= 4%
odp. cena jest niższa o 4%
x = 540 zl
100%x540zl/450 zl = 120%
120% - 100% = 20% Wartosc towaru podniesiono o 20%
20% z 540zl = 108zl
540zl - 108 zl = 432 zl
450zl - 432 zl = 18 zl
450 = 100%
432 = x%
432x100%/450 = 96%
100% - 96% = 4%
Odp: Cena towaru byla nizsza od ceny poczatkowej o 4%
90/450*100=20%
540*0,2=108
540-108=432
450-432=18
18/450*100=4%