# Quantitative Methods: Transportation Problem

(See attached file for full problem description)

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A logistics specialist for Wiethoff Inc. must distribute cases of parts from 3 factories to 3 assembly plants. The monthly supplies and demands, along with the per-case transportation costs are:

Destination Assembly Plant

1 2 3 Supply

Source A 5 9 16 200

Factory B 1 2 6 400

C 2 8 7 200

Demand 120 620 60

What are the total monthly transportation costs for the optimal solution?

B. Consider the following transportation problem:

1 2 Supply

1 5 6 100

2 4 2 200

3 3 6 150

4 9 7 50

Demand 250 250

How many supply-side constraints are there? Write the supply-side constraints.

C. Consider the following transportation problem:

1 2 Supply

1 5 6 100

2 4 2 200

3 3 6 150

4 9 7 50

Demand 250 250

How many demand-side constraints are there? Write the demand-side constraints

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#### Solution Preview

A logistics specialist for Wiethoff Inc. must distribute cases of parts from 3 factories to 3 assembly plants. The monthly supplies and demands, along with the per-case transportation costs are:

Destination Assembly Plant

1 2 3 Supply

Source A 5 9 16 200

Factory B 1 2 6 400

C 2 8 7 200

Demand 120 620 60

What are the total monthly transportation costs for the optimal solution?

Hints:

LP for the above model is

Decision variables:

xa1 be the quantity shipped from factory A to assembly plant 1. Similarly we have

xa2, xa3, xb1, xb2, xb3, xc1, xc2, and xc3

Objective function:

Min: 5 xa1+ 9xa2+ 16xa3+1 xb1+2xb2+6xb3+2xc1+8xc2+7xc3

As it is the case of balanced transportation problem, constraints are

Supply availability

xa1+ xa2+xa3=200

xb1+xb2+xb3=400

xc1+xc2+xc3=200

Demand requirements

xa1+ xb1+ xc1=120

xa2+ xb2+ ...

#### Solution Summary

The solutions for transportation problems are explained and the process is outlined.