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b) 60% - 180 dag
100% - x dag
x=(180*100)/60 = 300
c) tydzień ma 7 dni, więc mamy ułamek 4/7 ≈57,14 %
180 dag -- 60%
x -- 100%
x= (100%×180dag)/(60%) = 300 dag
7 --- 100%
4 --- x
x = (4×100%)/7 ≈ 57,14%