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80%-20
100%-x
x= (100%*20)/80% = 2000/80=25
80%- 25
100%- x
x= (100%*25)/80%= 2500/80= 31,25
80%- 31,25
100%- x
x= (100%*31,25)/80%= 3125/80=39,06
ta liczba to 39,06