LOG201: You have finally been promoted to Senior Manager for the nuts and bolts category at Locky Locke: Supply Chain Management Home Work, SUSS

Question 1

You have finally been promoted to Senior Manager for the nuts and bolts category at Locky Locke Inc. a manufacturer with a large demand for bolts at its three (3) factories. You have surveyed the market and found four (4) suppliers for a certain steady selling SKU, ZA27R46.  Your factories’ weekly demand for bolts are:

Factory 1: 9,500 cases/week
Factory 2: 6,500 cases/week
Factory 3: 17,000 cases/week

Each of the four suppliers can provide the ZA27R46, but they differ in unit price, weekly capacity, and distance to Locky Locke Inc. three factories. The unit prices and the weekly capacity for each of the four suppliers are shown below:

Supplier 1:  U.S. Ainbolt  – Unit cost:  2.50 $/case  Capacity  9,500 cases/week
Supplier 2:  Der Bolt, Thun  – Unit cost:  3.20  $/case  Capacity  10,000 cases/week
Supplier 3: Li Tningbolt –  Unit cost:  1.90  $/case  Capacity  7,000 cases/week
Supplier 4:  M. Bolton –   Unit cost:  2.80  $/case  Capacity  9,000 cases/week

You are trying to plan the weekly flow of bolts from these suppliers to your factories. Based on the current contract with your transportation carrier, the unit transportation cost for a case of bolts is $0.05 per mile from any of the suppliers to any of the factories.  The distances between the four suppliers and the three factories are given in the table below.

Let’s start by checking the spreadsheet model you use to solve the problem.

Below are three quick questions. These questions do not count towards your grade, they are just here to make sure you are starting off correctly! This is the only problem for which we show the solution.

Build the spreadsheet model to solve the problem, and plug in a “1” for each decision variable. There should be 12 decision variables.

What is your total weekly cost?

What is the left-hand side of the supply constraint for Supplier 1?

what is the left-hand side of the demand constraint for Factory 1?

Part 1

Currently, the factories operate independently. Disregarding any of the other factories, which supplier should Factory 2 select in order to have the lowest total (purchase and transport) cost for them?

Part 2

You want to take a holistic view of bolt sourcing instead of having each factory select its supplier on its own. You decide to create a model to help you select the optimal sourcing assignment for all of the factories for the ZA27R46 bolts. Based on this optimization model, what is the total weekly cost for supplying bolts for Locky Locke Inc.? Be sure to include the purchase price as well as the transportation costs.

Part 3

Based on your optimization model, which supplier should Factory 2 select in order to have the lowest total (purchase and transport) cost for Locky Locke Inc.?

Part 4

You want to discuss the situation with the general manager of Factory 2. How much is the difference between Factory 2’s total (purchase and transport) cost per week in Part 1 compared to the total cost per week from Part 3?

Part 5

You decide to re-negotiate with Supplier 1 (U.S. Ainbolt) to increase their capacity. They agree to increase it to 14,000 cases per week. How many cases per week does Supplier 1 (U.S. Ainbolt) send to Factory 2 in the new optimal solution?

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