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25⅕14 = 25*⅕*14=70
0,21%*70=0,147
jakim % liczby a jest liczba b
a) a=8 b=0,5
0,5:8=0,0625
0,0625*100%=6,25%
b) a=200 b=26
26:200=0,03
0,03*100%=3%
c) a=3 b=0,198.
0,198:3=0,066
0,066*100%=6,6%