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Question # 00005216
Subject: Mathematics
Due on: 12/31/2013
Posted On: 12/12/2013 11:57 AM

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14. Digital Controls, Inc. (DCI), manufactures two models of a radar gun used by police to monitor the speed of automobiles. Model A has an accuracy of plus or minus 1 mile per hour, whereas the smaller model B has an accuracy of plus or minus 3 miles per hour. For the next week, the company has orders for 100 units of model A and 150 units of model B. Although DCI purchases all the electronic components used in both models, the plastic cases for both models are manufactured at a DCI plant in Newark, New Jersey. Each model A case requires 4 minutes of injection-molding time and 6 minutes of assembly time. Each model B case requires 3 minutes of injection-molding time and 8 minutes of assembly time. Each model B case requires 3 minutes of injection-molding time and 8 minutes of assembly time. For next week, the Newark plant has 600 minutes of injection-molding time available and 1080 minutes of assembly time available. The manufacturing cost is $10 per case for model A and $6 per case for model B. Depending upon demand and the time available at the Newark plant, DCI occasionally purchases cases for one or both models from an outside supplier in order to fill customer orders that could not be filled otherwise. The purchase cost is $14 for each model A case and $9 for each model B case. Management wants to develop a minimum cost plan that will determine how many cases of each model should be produced at the Newark plant and how many cases of each model should be purchased. The following decision variables were used to formulate a linear programming model for this problem:

AM=number of cases of model A manufactured

BM=number of cases of model B manufactured

AP=number of cases of model A purchased

BP=number of cases of model B purchased

The linear programming model that can be used to solve this problem is as follows:

10 + 6 + 14 + 9

. .

1 +

+ 1 +

= 100

1 +

1 = 150

4 + 3

? 600

6 + 8

? 1080

, , , ? 0


Quantitative Analysis BA 452 Homework 3 Questions

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The computer solution is shown in Figure 3.18.

a. What is the optimal solution and what is the optimal value of the objective function?

b. Which constraints are binding?

c. What are the dual values? Interpret each.

d. If you could change the right-hand side of one constraint by one unit, which one would you choose? Why?


Quantitative Analysis BA 452 Homework 3 Questions

15. Refer to the computer solution to Problem 14 in Figure 3.18.

a. Interpret the ranges of optimality for the objective function coefficients.

b. Suppose that the manufacturing cost increases to $11.20 per case for model A. What is the new optimal solution?

c. Suppose that the manufacturing cost increases to $11.20 per case for model A and the manufacturing cost for model B decreases to $5 per unit. Would the optimal solution change?


Quantitative Analysis BA 452 Homework 3 Questions

16. Tucker Inc. produces high-quality suits and sport coats for men. Each suit requires 1.2 hours of cutting time and 0.7 hours of sewing time, uses 6 yards of material, and provides a profit contribution of $190. Each sport coat requires 0.8 hours of cutting time and 0.6 hours of sewing time, uses 4 yards of material, and provides a profit contribution of $150. For the coming week, 200 hours of cutting time, 18- hours of sewing time, and 1200 yards of fabric are available. Additional cutting and sewing time can be obtained by scheduling overtime for these operations. Each hour of overtime for the cutting operation increase the hourly cost by $15, and each hour of overtime for the sewing operation increase the hourly cost by $10. A maximum of 100 hours of overtime can be scheduled. Marketing requirements specify a minimum production of 100 suits and 75 sport coats. Let

S=number of suits produced

SC=number of sport oats produced

D1=hours of overtime for the cutting operation

D2=hours of overtime for the sewing operation

The computer solution is shown in Figure 3.19.

a. What is the optimal solution, and what is the total profit? What is the plan for the use of overtime?

b. A price increase fir suits is being considered that would result in a profit contribution of $210 per suit. If this price increase is undertaken, how will the optimal solution change?

c. Discuss the need for additional material during the coming week. If a rush order for material can be placed at the usual price plus an extra $8 per yard for handling, would you recommend the company consider placing a rush order for material? What is the maximum price Tucker would be willing to pay for an additional yard of material? How many additional yards of material should Tucker consider ordering?

d. Suppose the minimum production requirement for suits is lowered to 75. Would this change help or hurt profit? Explain.


Quantitative Analysis BA 452 Homework 3 Questions

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Quantitative Analysis BA 452 Homework 3 Questions

17.

The Porsche Club of America sponsors driver education events that provide high-performance

driving instruction on actual race tracks. Because safety is a primary consideration at such events,

many owners elect to install roll bars in their cars. Deegan Industries manufactures two types of roll

bars for Porsches. Model DRB is bolted to the car using existing holes in the car’s frame. Model DRW

is a heavier roll bar that must be welded to the car’s frame. Model DRB requires 20 pounds of a

special high alloy steel, 40 minutes of manufacturing time, and 60 minutes of assembly time. Model

DRW requires 25 pounds of the special high alloy steel, 100 minutes of manufacturing time, and 40

minutes of assembly time. Deegan’s steel supplier indicated that at most 40,000 pounds of the high-

alloy steel will be available next quarter. In addition, Deegan estimates that 20000 hours of

manufacturing time and 1600 hours of assembly time will be available next quarter. The profit

contributions are $200 per unit for model DRB and $280 per unit for model DRB. The linear

programming model for this problem is as follows:

200+

. .

20+ 25? 40,000

40+ 100? 120,000

60+ 40? 96,000

,? 0

The computer solution is shown in Figure 3.20.

a. What are the optimal solution and the total profit contribution/

b. Another supplier offered to provide Deegan Industries with an additional 500 pounds of the steel alloy at $2 per pound. Should Deegan purchase the additional pounds of the steel alloy? Explain.

c. Deegan is considering using overtime to increase the available assembly time. What would you advise Deegan to do regarding this option? Explain.

d. Because of increased competition, Deegan is considering reducing the price of model DRB such that the new contribution to profit is $175 per unit. How would this change in price affect the optimal solution? Explain.

e. If the available manufacturing time is increased by 500 hours, will the dual value for the manufacturing time constraint change? Explain.


Quantitative Analysis BA 452 Homework 3 Questions

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Quantitative Analysis BA 452 Homework 3 Questions

18. Davison Electronics manufactures two LCD television monitors, identified as model A and model B. Each model has its lowest possible production cost when produced on Davison’s new production line. However, the new production line does not have the capacity to handle the total production of both models. As a result, as least some of the production must be routed to a higher-cost, old production line. The following table shows the minimum production requirements for next month, the production line table shows the minimum production requirements for next month, the production line capacities in units per month, and the production cost per unit for each production line:

Production Cost per

Unit

Model

New Line

Old Line

Minimum Production

Requirements

A

$30

$50

50,000

B

$25

$40

70,000

Production Line

80,000

60,000

Capacity

Let:

AN= Units of model A produced on the new production line

AO= Units of model A produced on the old production line

BN = Units of model B produced on the new production line

BO= Units of model B produced on the old production line

Davison’s objective is to determine the minimum cost production plan. The computer solution is shown below.

a. Formulate the linear programming model for this problem using the following four constraints:

i. Constraint 1: Minimum production for model A

ii. Constraint 2: Minimum production for model B

iii. Constraint 3: Capacity of the new production line

iv. Constraint 4: Capacity of the old production line

b. Using computer solution in Figure 3.21, what is the optimal solution, and what is the total production cost associated with this solution?

c. Which constraints are binding? Explain.

d. The production manager noted that the only constraint with a positive dual values is the constraint on the capacity of the new production line. The manager’s interpretation of the dual value was that a one-unit increase in the right-hand side of this constraint would actually increase the total production cost by $15 per unit. Do you agree with this interpretation? Would an increase in capacity for the new production line be desirable? Explain.

e. Would you recommend increasing the capacity of the old production line? Explain.


Quantitative Analysis BA 452 Homework 3 Questions

f. The production cost for model A on the old production line is $50 per unit. How much would this cost have to change to make it worthwhile to produce model A on the old production line? Explain.

g. Suppose that the minimum production requirement for model B is reduced from 70,000 units to 60,000 units. What effect would this change have on the total production cost? Explain.

Optimal Objective Value

= 3850000.00000

Variable

Value

Reduced Cost

AN

50000.00000

0.00000

AO

0.0000

5.00000

BN

30000.00000

0.00000

BO

40000.00000

0.00000

Constraint

Slack/Surplus

Dual Value

1

0.00000

45.00000

2

0.00000

40.00000

3

0.00000

-15.00000

4

20000.00000

0.00000

OBJECTIVE COEFFICIENT RANGES

Variable

Objective Coefficient

Allowable Increase

Allowable Decrease

AN

30.00000

5.00000

Infinite

AO

50.00000

Infinite

5.00000

BN

25.00000

15.00000

5.00000

BO

40.00000

5.00000

15.00000

RIGHT HAND SIDE RANGES

Constraint

RHS Value

Allowable Increase

Allowable Decrease

1

50000.00000

20000.00000

40000.00000

2

70000.00000

20000.00000

40000.00000

3

80000.00000

40000.00000

20000.00000

4

60000.00000

Infinite

20000.00000


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Tutorial Preview …unit, xxxxx cost xxxx increase by xxx 25 If xxxxxx for xxxxx x increases xx 1 unit, xxxxx cost will xxxxxxxx by xx xx If xx additional minute xx assembly time xx available, xxxxx xxxx will xxxxxxxx by $ xxx d The xxxxxxxx time xxxxxxxxxx xxxx additional xxxxxx of assembly xxxx will decrease xxxxx by x xxx Note xxxx this will xx true up xx a xxxxx xx 1133 xx hours Some xxxxxxxx may say xxxx the xxxxxx xxxxxxxxxx for xxxxx A should xx selected because xxxxxxxxxx the xxxxxx xx one xxxx will decrease xxxx by $12 xx But, xxxxxxxx xxxx argument xx the extreme xxxxx argue for x demand xx x Quantitative xxxxxxxx BA 452 xxxxxxxx 3 Questions xx My xxxxxx xx this…
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Preview: Total xxxx = xxxxx Demand for xxxxx A Demand xxx model x xxxxxxxx time x ConstraintDual Value12 xx 9 0 x - xxx xxxxxxxxxxxxxxxxx demand xxx model A xxxxxxxxx by 1 xxxxx total xxxx xxxx increase xx $12 25 xx demand for xxxxx B xxxxxxxxx xx 1 xxxxx total cost xxxx increase by xx 00If xx xxxxxxxxxx minute xx assembly time xx available, total xxxx will xxxxxxxx xx $ xxxx The assembly xxxx constraint Each xxxxxxxxxx minute xx xxxxxxxx time xxxx decrease costs xx $ 375 xxxx that xxxx xxxx be xxxx up to x value of xxxx 33 xxxxx xxxx students xxx say that xxx demand constraint xxx model x xxxxxx be xxxxxxxx because decreasing xxx demand by xxx unit xxxx.....
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