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30dag=30% z kg
28,5*30%=28,5*30/100=28,5*3/10=8,55(zł)
8,55+6,60=15,15(zł)
28, 50 zł * 30 dag = 8,55 zł
6,60 zł + 8,55 zł = 15,15 zł
odp. : Pani Kasia zapłaciła 15,15 zł