Question

Problem 2

Stacys is a local department store. They need to determine the purchase quantity of winter jackets for the upcoming winter. The unit purchase cost is $30 per jacket and the unit selling price is $45.99 per jacket. If the jacket cannot be sold out at the end of the season, they would be salvaged at a unit price of $10.99 per jacket. The following table shows the demand for the jacket for the winter season and associated probabilities based on historical data.

What is the optimal order quantity of the jacket to maximize the expected seasonal profit? What are the expected sales & profit?

Problem 2 Stacys is a local department store. They need to determine the purchase quantity of winter jackets for the upcoming

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Answer #1

Cost of shortage Cs= Price - cost = 45.99-30 = 15.99

Cost of excess Ce = cost - salvage value = 30-10.99 = 19.01

service level = Cs / Cs+Ce = 15.99 / 15.99+19.01 = 0.4568

This service level can be achieved at D=145, or where the cumulative probabiity exceeds the service level.

Demand / Supply 90 110 145 180 200
90 15.99x90 15.99x90-20x19.01 15.99x90-55x19.01 15.99x90-19.01x90 15.99x90-19.01x110
110 15.99x90 15.99x110 15.99x110-35x19.01 15.99x110-70x19.01 15.99x110-19.01x90
145 15.99x90 15.99x110 15.99x145 15.99x145-35x19.01 15.99x145-19.01x55
180 15.99x90 15.99x110 15.99x145 15.99x180 15.99x180-19.01x20
200 15.99x90 15.99x110 15.99x145 15.99x180 15.99x200

The payoff tale can be simplified as

Prob. Profit net profit
Demand / Supply 90 110 145 180 200
90 1439 1059 393 -272 -652 0.12 1967 236.04
110 1439 1759 1094 428 52 0.15 4772 715.8
145 1439 1759 2318 1653 1272 0.35 8441 2954.35
180 1439 1759 2318 2878 2498 0.2 10892 2178.4
200 1439 1759 2318 2878 3198 0.18 11592 2086.56

It can be seen that the maximum profit of 2954.35 corresponds to D=145.

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