Answer :
Based on the financial cost incurred if supply is disrupted and the probability that this happens, the number of suppliers the manager should use is Two (2) suppliers.
How many suppliers should be used?
If 3 suppliers are used, the probability of disruption would be:
= Probability of super event + (1 - Probability of super event) x Probability of unique event^ number of suppliers
= 5% + (1 - 5%) x 10%³
= 0.145
The payoff would be:
= 2 million x 0.145 + 30,000
= $191,900
With two suppliers:
= 2 million x (5% + (1 - 5%) x 10%²) + 30,000
= $169,000
With one supplier :
= 2 million x (5% + (1 - 5%) x 10%) + 30,000
= $320,000
The lowest cost is with 2 suppliers so this should be chosen.
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