The demand for subassembly S is 140 units in week 7.

I don't understand the pattern with this problem

uestion list Click the icon to view the product structure and the time-phased product structure. Question 1 Click the icon to view the on-hand inventory. Construct a net material requirements plan using on-hand inventory (enter your responses as whole numbers). \\begin{tabular}{c|l|l|l|l|l|l|l|l|} \\hline \\( \\mathbf{W} \\) & Gross req & & & & 200 & & & \\\\ \\hline & On hand & & & & 30 & & & \\\\ \\hline & Net req & & & & 170 & & & \\\\ \\hline & Order receipt & & & & 170 & & & \\\\ \\hline & Order release & 170 & & & & & & \\\\ \\hline \\( \\mathbf{X} \\) & Gross req & & & & 200 & & & \\\\ \\hline & On hand & & & & 30 & & & \\\\ \\hline & Net req & & & & 170 & & & \\\\ \\hline & Order receipt & & & & 170 & & & \\\\ \\hline & Order release & & & 170 & & & & \\\\ \\hline \\( \\mathbf{Y} \\) & Gross req & & & 180 & & & & \\\\ \\hline & On hand & & & 40 & & & & \\\\ \\hline & Net req & & & 140 & & & & \\\\ \\hline & Order receipt & & & 140 & & & & \\\\ \\hline & Order release & 140 & & & & & & \\\\ \\hline \\( \\mathbf{Z} \\) & Gross req & & & 270 & & & & \\\\ \\hline & On hand & & & 270 & & & & \\\\ \\hline & Net req & & & 0 & & & & \\\\ \\hline & Order receipt & & & 0 & & & & \\\\ \\hline & Order release & & 0 & & & & & \\\\ \\hline \\end{tabular} uestion list Click the icon to view the product structure and the time-phased product structure. Question 1 Click the icon to view the on-hand inventory. Construct a net material requirements plan using on-hand inventory (enter your responses as whole numbers). \\begin{tabular}{c|l|l|l|l|l|l|l|l|} \\hline \\( \\mathbf{W} \\) & Gross req & & & & 200 & & & \\\\ \\hline & On hand & & & & 30 & & & \\\\ \\hline & Net req & & & & 170 & & & \\\\ \\hline & Order receipt & & & & 170 & & & \\\\ \\hline & Order release & 170 & & & & & & \\\\ \\hline \\( \\mathbf{X} \\) & Gross req & & & & 200 & & & \\\\ \\hline & On hand & & & & 30 & & & \\\\ \\hline & Net req & & & & 170 & & & \\\\ \\hline & Order receipt & & & & 170 & & & \\\\ \\hline & Order release & & & 170 & & & & \\\\ \\hline \\( \\mathbf{Y} \\) & Gross req & & & 180 & & & & \\\\ \\hline & On hand & & & 40 & & & & \\\\ \\hline & Net req & & & 140 & & & & \\\\ \\hline & Order receipt & & & 140 & & & & \\\\ \\hline & Order release & 140 & & & & & & \\\\ \\hline \\( \\mathbf{Z} \\) & Gross req & & & 270 & & & & \\\\ \\hline & On hand & & & 270 & & & & \\\\ \\hline & Net req & & & 0 & & & & \\\\ \\hline & Order receipt & & & 0 & & & & \\\\ \\hline & Order release & & 0 & & & & & \\\\ \\hline \\end{tabular}