need some guidance with a Operations Research Problem

Sep 2, 2004
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The problem I am facing is the following.

"A Company has developed two new toys for
possible inclusion in its product line for the upcoming Christmas
season. Setting up the production facilities to begin production
would cost $50,000 for toy 1 and $80,000 for toy 2. Once these
costs are covered, the toys would generate a unit profit of $10 for
toy 1 and $15 for toy 2.

The company has two factories that are capable of producing
these toys. However, to avoid doubling the start-up costs, just one
factory would be used, where the choice would be based on maximizing
profit. For administrative reasons, the same factory would
be used for both new toys if both are produced.

Toy 1 can be produced at the rate of 50 per hour in factory
1 and 40 per hour in factory 2. Toy 2 can be produced at the rate
of 40 per hour in factory 1 and 25 per hour in factory 2. Factories
1 and 2, respectively, have 500 hours and 700 hours of production
time available before Christmas that could be used to produce
these toys.

It is not known whether these two toys would be continued
after Christmas. Therefore, the problem is to determine how many
units (if any) of each new toy should be produced before Christmas
to maximize the total profit.

(a) Formulate an MIP model for this problem.
(b) Use the computer to solve this model."
 

DaveSimmons

Elite Member
Aug 12, 2001
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What work have you done on the homework so far?

If you don't at least try to solve these yourself you'll never learn the material and will bomb the tests.
 

Pugnax

Senior member
Jan 17, 2000
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Just set up your constraints (for each factory), and equations for the production rate/profit and let AMPL or whatever solve it for you...Not paying attention in your Linear Programming class perhaps?
 
Sep 2, 2004
128
0
0
This is what I have so far. I would gladly use some help or any suggestion, I am supposed to present this case today in class but I am not very confident on the answer.

Objective function
---------------------

Let
X1= the quantity of toy 1 to be produced
X2= the quantity of toy 2 to be produced

Yi= A binary variable for i=1,2
Y1=[1 if toy 1 is produced, 0 if toy 1 isint produced]
Y2=[1 if toy 2 is produced, 0 if toy 2 isint produced]


Max Z=10X1+ 15X2 -[50000Y1` + 80000Y2]


Time Function
----------------------

Let
T1 = Toy 1 Production time
T2 = Toy 2 Production time

50T1 +40T2 <- 500 -> Factory 1
40T1 + 25T2 <- 700 -> Factory 2



Plant Restriction
-------------------------

Let
Pi be a Binary variable for i=1,2

P1=[1 if the production is made in Factory 1, 0 if not]
P2=[1 if the production is made in Factory 2, 0 if not]

P1 +P2 =1