$8g$ of soil was extracted for soluble boron $($B$)$ with $60ml$ of hot water, then diluted twice. Each

dilution was $1$:$5$ dilution. The final dilution yielded $8mgN\frac{a^{+}}{L}.$

a$.$ Calculate the concentration of the initial extraction $(m\frac{g}{L}).(1$ point$)$

b$.$ Calculate the concentration of $N{a}^{+}$in the soil $(m\frac{g}{k}g).(1$ point$)$