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400 - 100%
240 - x
x=240/400*100=60%
zadanie 2
20 - 100%
9 - x
x=9/20*100=45%
zadanie 3
10 - 100%
2 - x
x=2/10*100=20%
zadanie 4
4 - 100%
0,5 - x
x=0,5/4*100=12,5%