Question $1($Mandatory$)(6$ points$)$

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Williston Technologies wishes to use MRP methodology to develop a plan for the

next $10$ weeks. Williston Technologies has gathered the following information:

If the image of a four item bill of materials above does not display properly on your computer, it is the same product structure diagram that appears at the top of page $412$ in your textbook.

Current Inventory Records

Item Lead Time $($weeks$)$ Lot Size On Hand Inventory

A $1$ LFL $100$

B $2250$

C $330150$

D $2100200$

Master Production Schedule

Item Week $1$ Week $2$ Week $3$ Week $4$ Week $5$ Week$6$ Week$7$ Week $8$ Week $9$ Week $10$

A $000020025000500$

How many D$\text{'}$s are in inventory at the end of week $7?$