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m(r1)=20g
c(p2)=8%
m(r2)=30g
c(p)=?
20g r1 - 100%
xg s1 - 40%
x=8g s1
30g r2 - 100%
yg s2 - 8%
y=2,4g s2
m(s)=m(s1)+m()s2)=8g+2,4g=10,4g
m(r)=m(r1)+m(r2)=20g+30g=50g
50g r - 100%
10,4g s - z%
z=20,8% - c(p) /stężenie procentowe/