Problem $13-7($Static$)$

Eighty units of end item $\backslash ($ X $\backslash )$ are needed at the beginning of week $6,$ and another $30$ units are needed at the beginning of week $8.$

Prepare a material requirements plan for component D$.$ D can only be ordered in whole cases $(50$ units per case$).$ One case of D is automatically received every other week, beginning in week $1($i$.$e$.,$ weeks $\backslash (1,3,5,7\backslash )).$ Also, there are $30$ units of B and $20$ units of D now on hand. Lead times for all items are a function of quantity: one week for up to $100$ units, two weeks for $101$ to $200$ units, three weeks for $201$ to $300$ units, and four weeks for $301$ or more units.

Note: Leave no cells blank $-$ be certain to enter $"0"$ wherever required.

$$ Answer is complete but not entirely correct.