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Liczba groszy w 50groszówkach = 6*50= 300
300:1000 * 100%= 3/10* 100%= 30%
Cała kwota=2×1złotówki+1×5złotówka+6×0,5zł=10zł
0.5*6=3zł
10zł-100%
3zł-x%
10x=300
x=30%