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b)90 cm /100cm *100%= 0,9*100%=90%
c)840m /1000m *100%=0,84*100%=84%
d)1,6 zł /100zł *100%= 160/100 %=1,6%
e) 2030g/3450g *100%=203000/3450 %=ok 58,84%