Determine $\%$BS given that $C{a}^{2+}$ is $8\mathrm{.}0,M{g}^{2+}$ is $2\mathrm{.}5,N{a}^{+}$is $0\mathrm{.}9,$ and $K^{+}$is $12,cmo{l}^{(+)}kg-1$ soil, respectively. Total CEC$=46\mathrm{.}0$cmol$(+)k{g}^{-1}$ soil.