1. The demand for subassembly S is 100 units in week 7, Each unit of S requires 1 unit of T and 2 unit of U. Each unit of T requires 1 unit of V, 2 unit of W and 1 unit of X. Finally each unit of U requires 2 unit of Y and 3 unit of Z. one firm manufacture all item, it takes 2 weeks to make S, 1 week to make T, 2 weeks to make U, 2 weeks to make V, 3 weeks to make W, 1 week to make X, 2 weeks to make Y and 1 week to make Z
    a) Construct a product structure. Identify all levels, parent and components
    b) Prepare a time phase product structure soal jawab MRP no 1
    (Jay Heizer, Barry Render., Operations Management., Pearson., Tenth Edition., page 605, problem 14.3)

2. Using the information in problem 1, construct a Groos material Requierement Plans soal jawab MRP no 2
(Jay Heizer, Barry Render., Operations Management., Pearson., Tenth Edition., page 605, problem 14.4)

3.  Refer again to problems 1 and 2. In addition to 100 units of S, there is also a demand for 20 units of U, Which is a component of S. The 20 units of U are needed for maintenance purposes. These units are needed ini week 6, modify the Gross Material Requierment plan to reflect this change soal jawab MRP no 3
(Jay Heizer, Barry Render., Operations Management., Pearson., Tenth Edition., page 605, problem 14.6)

4. Using the information in problem 1, construct a net material requirements plan using the following on-hand inventory, S (20 units), T (20 units), U (40 unites), V (30 units), W (30 units), X (25 units), Y (240 units) and Z (40 units) soal jawab MRP no 4
(Jay Heizer, Barry Render., Operations Management., Pearson., Tenth Edition., page 605, problem 14.5)

5. Develop a lot-for lot solution and calculate total relevant cost for the data in the preceding table (Holding cost $2.50/unit/week; set-up cost = $150; lead time 1 week, beginning inventory 40 unit)
(Jay Heizer, Barry Render., Operations Management., Pearson., Tenth Edition., page 607, problem 14.17)

6. Develop an EOQ solution and calculate total relevant costs for the data in the preceding table. Stockout cost equal $10 per unit. (Holding cost $2.50/unit/week; set-up cost = $150; lead time 1 week, beginning inventory 40 unit)
(Jay Heizer, Barry Render., Operations Management., Pearson., Tenth Edition., page 607, problem 14.18)

7. Using the gross requirement schedule in example 4,5,6 in the text, prepare alternative ordering system that always orders 100 unit the week prior to a shortage (a fixed order quantity of 100) with the same cost as in the example (set-up cost at $100 each, holding cost $1 per unit per period). What is the cost of this ordering system
(Jay Heizer, Barry Render., Operations Management., Pearson., Tenth Edition., page 607, problem 14.20)