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1018 - 100%
521 - x%
x=(521*100)/1018 = 51,179 %
lub 1018 - 100%
600 (bo z dokładnością do 150) - x%
x=(600*100)/1018=58,9%
2.
7% - 15,40 zł
100% - x
x=(100*15,40)/7 = 220zł
D.