AMS 341 (Fall, 2023) Operations Research I: Deterministic Models Homework Set # 5
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AMS 341 (Fall, 2023)
Operations Research I: Deterministic Models
Homework Set # 5
Due on BrightSpace by 10am, Wednesday, October 11, 2023.
Read Sections 1,2,3 of Chapter 5. Section 4 of Chapter 6 and page 287 (adding a new activity).
Submit the following two problems:
(1). Consider the LP below. The BFS (“corners”) are (0,1) (0,3) (3,3/2) (10/3,1). The optimal solution is at x1 = 3 and x2 = 3/2.
max z = 2x1 + 2x2
s.t. 3x1 + 2x2 ≤ 12
x1 + 2x2 ≤ 6
x2 ≥ 1
x1 , x2 ≥ 0
(a). What is the range of c1 the objective coefficient of x1 (currently 2) for which this BFS remains optimal:
(b). What is the range of b3 the right hand side of the third constraint (currently 1) for which this BFS remains optimal:
(2). A company uses labour and raw material to produce three products:
resource |
product 1 |
product 2 |
product 3 |
Labor(hours) |
3 |
4 |
6 |
raw material (units) |
2 |
2 |
5 |
sale price($) |
6 |
8 |
13 |
Currently 60 units of raw material are available. Upto 90 hours of labor can be purchase at $ 1 per hour. Let xi be the units of product i produced, and L the number of hours of labor purchsed. Use the Lindo output below to answer each of the following parts. Make sure to give a brief explanation!
(a). What is the most the company should pay for an additional unit of raw material?
(b). Suppose the sale price for product 2 become 7.5 (instead of 8). What is the new z?
(c). What would be the new optimal solution if the sale price of product 3 increased by 0.5 and only 50 units of raw material are available?
(d). The company is considering a 4th type of item that requires 2 hours of Labor, 3 units of raw material and sells for $4. Should the company produce any of product 4?
2023-12-22