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Cena soku brutto to 107% czyli x zł
100%------- 4 zł
107%------- x zł
x= 107*4/100= 4,28 zł - cena soku brutto
4zł - 100%
x zł - 7 %
4zł * 7% 28zł
-------------- = --------- = 0,28zł
100% 100
4zł + 0,28zł = 4,28zł