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a) 3000 zł - 100%
x zł - 10 %
x = 300 zł
b) 200 m - 100 %
x m - 125 %
x = 250
c) 400 zł - 100 %
420 zł - x %
x = 105 %
x = 105 % - 100 %
x = 5 %
300 - 10%
90% - 2700.
b) 200m - 100%
450 m - 225%.
c) nie rozumiem polecenia. o 400 - 100% 420 - x% ?