One unit of A is made of one unit of B and one unit of C. B is made of four units of C

and one unit each of E and F. C is made of two units of D and one unit of E. E is made

of three units of F. Item C has a lead time of one week; Items A, B, E, and F have two

week lead times; and Item D has a lead time of three weeks. Lot-for-lot sizing is used

for Items A, D, and E; lots of size 50, 100, and 50 are used for Items B, C, and F,

respectively

Items A, C, D, and E have on-hand (beginning) inventories of 20, 50, 100, and 10,

respectively; all other items have zero beginning inventory. We are scheduled to receive

10 units of A in Week 1, 100 units of C in Week 2, and 100 units of D in Week 3; there

are no other scheduled receipts.

a. Draw the product tree of the end item A, and determine the low-level codes of all the

items in the tree.

b. What is the minimum number of weeks that you should include in the planning

horizon to make the MRP records feasible?

c. Assume for now that there are no scheduled receipts and no beginning inventories

for all the items in the bill of material. How many Fs do you need to make 100 As?