Odpowiedź:
cp1=15%
mr1=200g
15%=ms/200g ×100%
ms1=30g
cp2=20%
mr2=0.4kg=400g
20%=ms2/400g ×100%
ms2=80g
ms3=ms2+ms1=30g+80g=110g
mr3=mr2+mr1=200g+400g=600g
cp3=110g/600g ×100%
cp3=18.3%
