Demand and Working Days Inventory \begin{tabular}{|l|c|} \hline Beginning inventory & 308 units \\ \hline Safety stock required & 17% of monthly demand \\ \hline \end{tabular} Demand and Working Days Inventory \begin{tabular}{|l|c|} \hline Beginning inventory & 308 units \\ \hline Safety stock required & 17% of monthly demand \\ \hline \end{tabular}