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y×90%=270
270-90%
y-100%
y=300
300-120%
x-100%
x=250
90% * x =270
x=279/0,9
x = 300 obniżka o 10 %
120%*x = 300
x= 300/1,2
x = 250 podwyżka o 20%
odp Garsonka na początku kosztowała 250 zł.