Product A is an end item and is made from three units of B, three units of C and two units of D. B is made of three units of E and two of F. C is made of two units of F and one of D. A and B have a lead time of one week. C and D have lead times of two weeks, and E and F have lead times of three weeks. Lot sizes for A, B and D are L4L. Item C has a lot size of 60. E and F have a lot size of 100. There is 50 units of item B on hand, and 25 units of item A. There is a scheduled receipt for 50 units of item F in week three.

A) Show the bill of materials (product structure tree)

B) If 120 units of A are required in Week 8, develop the MRP planning schedule, specifying when items are to be ordered and received.

\begin{tabular}{|c|c|c|c|c|c|c|c|c|c|} \hline MRP Worksheet & Week Number & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 \\ \hline & Quantity & & & & & & & & \\ \hline & & & & & & & & & \\ \hline Item: & Gross requirements & & & & & & & & \\ \hline & Scheduled receipts & & & & & & & & \\ \hline Quantity = & Projected on hand & & & & & & & & \\ \hlineLT= & Net requirements & & & & & & & & \\ \hline Lot Size = & Planned-order receipts & & & & & & & & \\ \hline On hand = & Planned-order releases & & & & & & & & \\ \hline & & & & & & & & & \\ \hline Item: & Gross requirements & & & & & & & & \\ \hline & Scheduled receipts & & & & & & & & \\ \hline Quantity = & Projected on hand & & & & & & & & \\ \hline LT= & Net requirements & & & & & & & & \\ \hline Lot Size = & Planned-order receipts & & & & & & & & \\ \hline On hand = & Planned-order releases & & & & & & & & \\ \hline & & & & & & & & & \\ \hline Item: & Gross requirements & & & & & & & & \\ \hline & Scheduled receipts & & & & & & & & \\ \hline Quantity = & Projected on hand & & & & & & & & \\ \hline LT= & Net requirements & & & & & & & & \\ \hline \end{tabular}