Current decision to buy: Ross White's machine shop uses 200 brackets each month during the course of a year. This usage is relatively constant throughout the year. Currently, these brackets are purchased from a supplier 100 miles away for $16 each and the lead time is 2 days. The holding cost per bracket per year is $1.60 (10% of the unit cost) and the annual ordering cost per order is $18.50. There are 240 working days per year. Possible future decision to make in-house: Ross White is reconsidering his decision of buying the brackets and is considering making the brackets in-house. He has determined the set up costs would be $24.50 in machinist time and lost production time. Forty eight brackets could be produced in a day once the machine has been set up. Ross estimates that the cost (including labor and materials) of producing one bracket would be $14.85. The holding cost would be 10% of the cost. a. What is the EOQ given Ross' current decision to buy the brackets? What is the total annual cost? b. If Ross wants to start making the brackets in-house, what is the optimal production quantity? What is the total annual cost? c. Based on ALL the information you have, which decision should Ross make and why?

Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
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Current decision to buy: Ross White's machine shop uses 200 brackets each month during the course of a year. This usage is relatively constant throughout the year. Currently, these brackets are purchased from a supplier 100 miles away for $16 each and the lead time is 2 days. The holding cost per bracket per year is $1.60 (10% of the unit cost) and the annual ordering cost per order is $18.50. There are 240 working days per year. Possible future decision to make in-house: Ross White is reconsidering his decision of buying the brackets and is considering making the brackets in-house. He has determined the set up costs would be $24.50 in machinist time and lost production time. Forty eight brackets could be produced in a day once the machine has been set up. Ross estimates that the cost (including labor and materials) of producing one bracket would be $14.85. The holding cost would be 10% of the cost.

a. What is the EOQ given Ross' current decision to buy the brackets? What is the total annual cost?

b. If Ross wants to start making the brackets in-house, what is the optimal production quantity? What is the total annual cost?

c. Based on ALL the information you have, which decision should Ross make and why?

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