Answer$($s$)$: $($Your response$($s$)$ are shown below, followed by the correct answer$($s$).)$

The product structure for Item $x$ specifies the required number of units for each constituent part within parentheses. $($Note that $4$ units of part $C$ are required for $x$ and one unit of part $C$ by $B.)$ given the the following table:

$\backslash$table$[[$Part$,\backslash$table$[[$Lead Time$],[($in weeks$)]]],[$B$,1],[$C$,3],[$D$,2],[$H$,2],[$K$,2],[$M$,2],[$N$,3],[$X$,3],[$Z$,4]]$

There is no inventory on hand and the order for Item $x$ is to be shipped at the beginning of week $13.$

In what week will manufacture of part $K$ start?

$4$ Specify only the number.

Feedback:

Note that Part $K$ appears at levels $2$ and $3.$