solve $14\mathrm{.}7$ in the pic based on $14\mathrm{.}5$ which is this question $14\mathrm{.}5$ The demand for subassembly S is $100$ units in week $7.$

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 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$.$

a$)$ Construct a product structure. Identify all levels, parents, and

components.

b$)$ Prepare a time$-$phased product structure.