Final answer:
The question lacks the necessary information to provide an exact number of additional units of E needed. Details such as the number of E components required per end item are missing, and the provided procedures about reagents and student teams do not directly answer the question.
Step-by-step explanation:
The question provided does not supply sufficient information to determine exactly how many additional units of E are needed to assemble 20 units of the end item. Typically, this type of problem would require a Bill of Materials (BOM) that outlines the number of component E required per end item.
We might also need to consider any existing inventory of component E and whether the 20 units of the end item are incremental production or the total production requirement.
In this scenario, since the procedure states that the reagents and equipment needs are calculated per six student teams with about a 20% excess included, this could imply a relationship between resources and output.
However, the specific needs cannot be determined unless we know how many units of E go into one end item and the relation of student teams to end item production.
If additional information was available indicating that, for example, each end item requires 1 unit of E, then assembling 20 units would require 20 additional units of E. Without precise data, any answer would be speculative.
The following table lists the components to assemble and end item, lead times and quantities on hand.
Item End B C D E F G H
LT (wk) 1 3 4 4 2 1 2 1
Amount on hand1 0 10 9 25 11 29 6 0