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x=200zl
x=100%
x= 340*100:170
x= 34000:170
x= 200
Bilet mamy kosztował 200zl
x - bilet mamy
100% - 340 zł
30% - x
100x = 30* 340
x = 102
340zł - 102 zł = 238 zł
Odp.Bilet mamy kosztował 238 zł