Question

In: Operations Management

Part 4.     Bank Assignments. A bank distributes checks to different sites to be processed within a...

Part 4.     Bank Assignments. A bank distributes checks to different sites to be processed within a large metro area. Each site has the capacity to process different amounts of checks per day. The checks that need to be processed each day are personal, payroll, draft, and government. The total demand is different for each type of check. The cost to process each type of check varies with the site. These values are summarized in the table.

Cost per check

Site1

Site2

Site3

Site4

Site5

Total Demand

Checks/day

Personal

2.55

2.35

3.22

2.85

2.25

700

Payroll

1.45

1.35

2.1

1.95

1.84

400

Draft

1.67

1.51

1.89

1.86

1.78

200

Government

1.34

1.35

1.41

1.3

1.33

100

Total Capacity

Checks/day

500

300

300

200

200

Question 1a. What is the minimum cost that can be achieved and meet requirements?

A. $2680    B. $2798    C. $2579    D. $2783    E. None of the above

Question 1b. From concern about a site processing a large number of one type of check, a limit of 250 transactions per type of check for each site is being considered. What is the minimum increase in cost due to this added constraint?   A. $20    B. $15    C. $10    D. $5    E. None of the above

Solutions

Expert Solution

Formulation in Excel:

Solver inputs:

Solution:

Site1 Site2 Site3 Site4 Site5 Total Demand
Personal 100 300 0 100 200 700 700
Payroll 400 0 0 0 0 400 400
Draft 0 0 200 0 0 200 200
Government 0 0 0 100 0 100 100
Total 500 300 200 200 200
Total Capacity 500 300 300 200 200
COSTS Site1 Site2 Site3 Site4 Site5
Personal 2.55 2.35 3.22 2.85 2.25
Payroll 1.45 1.35 2.1 1.95 1.84
Draft 1.67 1.51 1.89 1.86 1.78
Government 1.34 1.35 1.41 1.3 1.33
Total cost 2783

So, answer to 1A is 2783

-----------------------

1B

Add the following constraint to solver:

Solution:

Site1 Site2 Site3 Site4 Site5 Total Demand
Personal 250 150 0 100 200 700 700
Payroll 250 150 0 0 0 400 400
Draft 0 0 200 0 0 200 200
Government 0 0 0 100 0 100 100
Total 500 300 200 200 200
Total Capacity 500 300 300 200 200
COSTS Site1 Site2 Site3 Site4 Site5
Personal 2.55 2.35 3.22 2.85 2.25
Payroll 1.45 1.35 2.1 1.95 1.84
Draft 1.67 1.51 1.89 1.86 1.78
Government 1.34 1.35 1.41 1.3 1.33
Total cost 2798

So,

The cost increases by 2798 - 2783 = 15


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