41. A manager is góing to purchase new processing equipment and must decide on the number of spare parts to order with the new equipment. The spares cost $200 each, and any unused spares will have an expected salvage value of $50 each. The probability of usage can be described by this distribution: Number 1 2 3 Probability 10 50 25 15
41. A manager is góing to purchase new processing equipment and must decide on the number of spare parts to order with the new equipment. The spares cost $200 each, and any unused spares will have an expected salvage value of $50 each. The probability of usage can be described by this distribution: Number 1 2 3 Probability 10 50 25 15
Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter2: Introduction To Spreadsheet Modeling
Section: Chapter Questions
Problem 20P: Julie James is opening a lemonade stand. She believes the fixed cost per week of running the stand...
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Transcribed Image Text:41. A manager is going to purchase new processing equipment and must decide on the number of
spare parts to order with the new equipment. The spares cost $200 each, and any unused spares
will have an expected salvage value of $50 each. The probability of usage can be described by this
distribution:
Number
1
2
Probability
10
.50
25
15
600
Chapter Thirteen Inventory Management
If a part fails and a spare is not available, two days will be needed to obtain a replacement
and install it. The cost for idle equipment is $500 per day. What quantity of spares should be
ordered?
a. Use the ratio method.
b. Use the tabular method (see Table 13.3).
Expert Solution

Step 1
- Ratio method –
Number |
Probability |
Cumulative probability |
0 |
0.10 |
0.10 |
1 |
0.50 |
0.60 |
2 |
0.25 |
0.85 |
3 |
0.15 |
1.00 |
Cost of idle equipment =
Cost of excess inventory= Unit cost - salvage value
= $200 - $50 = $150
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