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mr =300
cp=2000/300 = 6.66
m sub= 200g*0,1=20g
m roz= 300g
C=20/300 = 0,067=6,7%
cp=10%
ms=10×200/100=2000/100=20g
ms2=20g
mr2=200+100=300g
cp2=20×100/300=2000/300=6.66%