The demand cor subassembly S is $100$ units in wekk $7.$ Each unit of S requires $1$ unit of T and $2$ units of U$.$ Each unit of T requires $1$ unit of V$,2$ units of of W$,$ and $1$ unit of X$.$ Finally, each unit of U requires $2$ units Y and $3$ units of Z$.$ One firm manufactures all items. It takes $2$ weeks to make S$,1$ week to make T a component of S$.$ The $20$ units of U are needed for maintenanxe purposes. These units are needed in week $6.$ Additonally, a new order has been received for $80$ units of S due in week $8.$ Modify the net requirements plan to reflect these changes.