(Solved): i need help with this please A terrestrial ecosystem produces 800kcal2/yr. In this ecosystem the pr ...

A terrestrial ecosystem produces $800{\mathrm{kcal}}^2/\mathrm{yr}$. In this ecosystem the primary consumers eat $10\%$ of the primary production. Only $50\%$ of what they eat gets assimilated and only $20\%$ of that gets converted to primary consumer biomass What is the trophic elficiency of primary consumers in this ecosystem? \begin{tabular}{|l} \hline $1\%$ \\ \hline $20\%$ \\ \hline $5\%$ \\ \hline $8\%$ \\ \hline $10\%$ \\ \hline \end{tabular}