The demand for subassembly S is 80 units in week 7. Each unit of S requires 2 units of T and 1 unit of U. Each unit of T requires 1 unit of V, 1 unit of W, and 1 unit of X. Finally, each unit of U requires 2 units of Y and 3 units of Z. One firm manufactures all items. It takes 2 weeks to make S, 1 week to make T, 2 weeks to make U, 2 weeks to make V, 3 weeks to make W, 1 week to make X, 2 weeks to make Y, and 1 week to make Z.

More Info The time-phased product structure. \begin{tabular}{cc|cc} \hline Item & On-HandInventory & Item & On-HandInventory \\ \hline S & 20 & W & 25 \\ T & 20 & X & 30 \\ U & 30 & Y & 60 \\ V & 30 & Z & 40 \\ \hline \end{tabular} \begin{tabular}{l|l|c|c|c|l|l|l|l|l} \hline & Order release & 0 & & & & & & & \\ \hline Z & Gross req & & & 240 & & & & & \\ \hline & On hand & & & 40 & & & & \\ \hline & Net req & & & 200 & & & & & \\ \hline & Order receipt & & & 200 & & & & \\ \hline & Order release & & 200 & & & & & & \\ \hline \end{tabular}