We’re Computers sells PCs to colleges on the East Cost and ships them from three distribution centers (DCs). The firm is able to supply the following numbers of PCs to the colleges by the beginning of the academic year. Distribution Centers Supply (PCs) 1. Richmond 420 2. Atlanta 610 3. Washington, DC 340 Total 1,370 Four colleges have ordered PCs that must be delivered and installed. Colleges Demand (PCs) A. Tech 520 B. A & M 250 C. State 400 D. Central 380 Total 1,550 The shipping and installation costs per PC from each distributor to each college are as follows: To (cost) From A B C D 1 $22 $17 $30 $18 2 15 35 20 25 3 28 21 16 14 a. Formulate the problem and solve by using Excel Solver. That is how many computers from each DC will be shipped to each college and what will be the total cost? b. To better meet demand at the four colleges it supplies, the company is considering two alternatives: (1) expand Richmond DC to a capacity of 600, at a cost equivalent to an additional $6 in handling and shipping per unit; or (2) purchase a new DC in Charlotte that can supply 300 units with shipping costs of $19 to Tech, $26 to A & M, $22 to State, and $16 to Central. Which alternative should management select, based solely on transportation costs? c. We’re Computers has determined that when it is unable to meet the demand for PCs at the colleges it supplies, the colleges tend to purchase PCs elsewhere in the future. Thus, the                 firm has estimated a shortage cost for each PC demanded but not supplied that reflects the loss of future sales and goodwill. These costs for each college are as follows: College Cost/PC A. Tech $40 B. A & M 65 C. State 25 D. Central 50 Solve part (a) with these shortage costs included. Compute the total transportation cost and the total shortage cost. (Hint: Consider shortage as the 4th DC)

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We’re Computers sells PCs to colleges on the East Cost and ships them from three
distribution centers (DCs). The firm is able to supply the following numbers of PCs to the
colleges by the beginning of the academic year.
Distribution
Centers
Supply
(PCs)
1. Richmond 420
2. Atlanta 610
3. Washington, DC 340
Total 1,370
Four colleges have ordered PCs that must be delivered and installed.
Colleges Demand
(PCs)
A. Tech 520
B. A & M 250
C. State 400
D. Central 380
Total 1,550
The shipping and installation costs per PC from each distributor to each college are as follows:
To (cost)
From A B C D
1 $22 $17 $30 $18
2 15 35 20 25
3 28 21 16 14
a. Formulate the problem and solve by using Excel Solver. That is how many computers from
each DC will be shipped to each college and what will be the total cost?
b. To better meet demand at the four colleges it supplies, the company is considering two
alternatives: (1) expand Richmond DC to a capacity of 600, at a cost equivalent to an
additional $6 in handling and shipping per unit; or (2) purchase a new DC in Charlotte that
can supply 300 units with shipping costs of $19 to Tech, $26 to A & M, $22 to State, and $16
to Central. Which alternative should management select, based solely on transportation
costs?
c. We’re Computers has determined that when it is unable to meet the demand for PCs at the
colleges it supplies, the colleges tend to purchase PCs elsewhere in the future. Thus, the
 
 
 
 
 
 
 
 
firm has estimated a shortage cost for each PC demanded but not supplied that reflects the
loss of future sales and goodwill. These costs for each college are as follows:
College Cost/PC
A. Tech $40
B. A & M 65
C. State 25
D. Central 50
Solve part (a) with these shortage costs included. Compute the total transportation cost and
the total shortage cost. (Hint: Consider shortage as the 4th DC)
1
2
A
3
4 Decision Variables
5 Objective Function Coefficient
6 Constraints:
7 Constraint #1 supply 1
8 Constraint #2 supply 2
9 Constraint #3 supply 3
10 Constraint #4 supply 4
11 Constraint #5 demand a
12 Constraint # 6 demand b
13 Constraint #7 demand c
14 Constraint #8 demand d
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
(i=1,2,3,4)
(j= 1,2,3,4)
B
X1
0
22
1
Minimum cost= $24930
1
To minimize the transport cost,
X1 + X2 + x3 + x4 <= 420 (SUPPLY 1)
X5 + X6 + X7 + X8 <= 610 (SUPPLY 2)
X9 + X10 + X11 + X12 <= 340 (SUPPLY 3)
X13 + X14 + X15 + X16 <= 180 (SUPPLY 4)
X1 + X2 + X3 + X4 = 520 (DEMAND A)
X5 + X6 + X7 + X8 = 250 (DEMAND B)
X9 + X10 + X11 + X12 = 400 (DEMAND C)
X13 + X14 + X15 + X16 = 380 (DEMAND D)
C
X2
250
17
1
1
D
Let
Xij= number of units transported from distributor i to university
j
X3
0
30
1
1
E
X4
80
18
1
1
F
X5
520
15
1
1
G
X6
0
35
1
1
H
X7
60
20
1
1
a) stated in text box to the left
b) 24930 + 6 x 600 = $25530
|
X8
0
25
1
J
X9
0
28
1
1
K
X10
0
21
1
1
L
X11
340
16
1
M
X12
0
14
1
1
N
X13
0
19
1
1
O
X14
0
26
1
1
P
X15
0
22
1
1
■
Q
X16
300
16
1
1
R
24930
LHS
S
Sign RHS
330 <= 420
580 <= 610
340 <=
340
300 <=
520
250 =
400 =
380
=
T
=
300
520
250
400
380
Transcribed Image Text:1 2 A 3 4 Decision Variables 5 Objective Function Coefficient 6 Constraints: 7 Constraint #1 supply 1 8 Constraint #2 supply 2 9 Constraint #3 supply 3 10 Constraint #4 supply 4 11 Constraint #5 demand a 12 Constraint # 6 demand b 13 Constraint #7 demand c 14 Constraint #8 demand d 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 (i=1,2,3,4) (j= 1,2,3,4) B X1 0 22 1 Minimum cost= $24930 1 To minimize the transport cost, X1 + X2 + x3 + x4 <= 420 (SUPPLY 1) X5 + X6 + X7 + X8 <= 610 (SUPPLY 2) X9 + X10 + X11 + X12 <= 340 (SUPPLY 3) X13 + X14 + X15 + X16 <= 180 (SUPPLY 4) X1 + X2 + X3 + X4 = 520 (DEMAND A) X5 + X6 + X7 + X8 = 250 (DEMAND B) X9 + X10 + X11 + X12 = 400 (DEMAND C) X13 + X14 + X15 + X16 = 380 (DEMAND D) C X2 250 17 1 1 D Let Xij= number of units transported from distributor i to university j X3 0 30 1 1 E X4 80 18 1 1 F X5 520 15 1 1 G X6 0 35 1 1 H X7 60 20 1 1 a) stated in text box to the left b) 24930 + 6 x 600 = $25530 | X8 0 25 1 J X9 0 28 1 1 K X10 0 21 1 1 L X11 340 16 1 M X12 0 14 1 1 N X13 0 19 1 1 O X14 0 26 1 1 P X15 0 22 1 1 ■ Q X16 300 16 1 1 R 24930 LHS S Sign RHS 330 <= 420 580 <= 610 340 <= 340 300 <= 520 250 = 400 = 380 = T = 300 520 250 400 380
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