\begin{tabular}{|c|c|c|c|c|c|} \hline \multirow[t]{2}{*}{ Plan A } & \multicolumn{3}{|c|}{ Chase demand by hiring and layoffs } & & \\ \hline & demand & regular time capacity & regular time production & units increase & units decrease \\ \hline Layoff initial & 1500 & & & & \\ \hline period 1 & 1300 & 1100 & 1100 & 0 & 400 \\ \hline period 2 & 1400 & 1400 & & & \\ \hline period 3 & 1500 & & & & \\ \hline period 4 & 1300 & & & & \\ \hline \multirow[t]{2}{*}{ total units } & 5500 & & & & \\ \hline & & & 30 a unit & 4 a unit & 8 a unit \\ \hline \multicolumn{6}{|l|}{ Subtotal cost } \\ \hline \multicolumn{6}{|l|}{ total cost } \\ \hline \multirow[t]{2}{*}{ Plan B } & \multicolumn{4}{|c|}{ Produce at constant rate of 1200 and obtain remainder from overtime } & \\ \hline & demand & regular time capacity & regular time production & units increase & units decrease \\ \hline Layoff initial & 1500 & & & & \\ \hline period 1 & 1300 & 1100 & 1100 & 0 & 400 \\ \hline period 2 & 1400 & 1400 & & & \\ \hline period 3 & 1500 & & & & \\ \hline period 4 & 1300 & & & & \\ \hline \multirow[t]{2}{*}{ total units } & 5500 & & & & \\ \hline & & & 30 a unit & 4 a unit & 8 a unit \\ \hline & & & & & \\ \hline \end{tabular} Following aggregate demand requirements and other data for upcoming four quarters \begin{tabular}{|l|r|l|} \hline Quarter & Demand & \\ \hline & 1 & 1300 units \\ \hline & 1400 units \\ \hline & 1500 units \\ \hline & 1300 units \\ \hline Previous quarter output & 1500 units \\ \hline Beginning inventory & 200 units \\ \hline Stockout cost & 50 per unit \\ \hline Inventory holding cost & 10 per unit at end of quarter \\ \hline Hiring workers & 4 per unit \\ \hline Laying off worker & 8 per unit \\ \hline Unit cost & 30 per unit \\ \hline Overtime & 10 extra per unit \\ \hline \end{tabular}