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cp=40%
mr=50g
ms=cp*mr/100%
ms1=40%*50g/100%=20g
ms1=20g
ms2=?
cp2=20%
mr2=15g
ms=20%*15g/100=3g
cp=ms/mr*100%
mr=50g+25g=75g
ms=20g+3g=23g
cp=23g/75g*100%=30,66% w przybliżeniu 31%