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b) 12
c) 24
d) 35
b) 50 % z liczby 24=50/100 * 24=1/2 * 24=24/2=12
c) 40 % z liczby 60=40/100 * 60=2/5 * 60=120/5=24
d) 70 % z liczby 50=70/100 * 50=3500/100=35