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b)75,83%
c)2,54%
'd)66,67%
1,6/100*100%=1,6%
1godz(60 min) jest 45min 30 s
45,5/60*100%=75,8%
1tona(1000kg) 25kg 25dag
25,25/1000*100%=2,5%
3450 gramów(3,45kg) jest 2kg 30 dag
2,3/3,45*100%=66,7%