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(84:300)*100%=0,28*100%=28%
cena wzrosła o 28%
300zł + 300zł * x = 384zł
300zl * x = 384zł - 300zł
300zł * x = 84zł /300zł
x = 84zł/300zł
x = 0,28 = 28%
Cena wzrosła o 28%