simak ui 2016. kimia

anggap %K-41 = X%, sehingga %K-39= (100-X)%

39,09 = 40,96.X% + 38,96.(100-X)%
3909 = 40,96X + 3896 - 38,96X
13 = 2X
X = 13/2 = 6,5

%K-41 = X% = 6,5%