Answer the questions based on the material discussed:

Problem:

Heather Adams, a production manager for a Colorado exercise equipment manufacturer, needs to schedule an order for 50 Ultima Steppers, to be shipped in week 8. The subscripts indicate the quantity needed for each parent. Below is information about the "steppers":

Develop a product structure (BOM) (product structural tree). Develop a time phase structure (Gantt Chart). Develop a net material requirements plan (MRP) for E.

\begin{tabular}{|c|c|c|c|} \hline ITEM & LEAD TIME & ON-HAND INVENTORY & COMPONENTS \\ \hline Stepper & 2 & 20 & A(1,,B(3),C(2) \\ \hline A & 1 & 10 & D(1,,F(2) \\ \hline B & 2 & 30 & E(1,,F(3) \\ \hline C & 3 & 10 & D(2,,E(3) \\ \hline D & 1 & 15 & \\ \hline E & 2 & 5 & \\ \hline F & 2 & 20 & \\ \hline \end{tabular}