Answer: 80% = 0.8
Explanation:
The following can be gotten from the question:
Cu = Shortage cost
Co = Excess cost
Since the shortage cost is four times excess cost. This will be:
Cu = 4 × Co
Cu = 4Co
Therefore, Co = 1/4Cu = 0.25Cu
The optimum service level will then be calculated as:
= Cu / (Cu + Co)
= Cu / Cu + 0.25Cu
= Cu / 1.25Cu
= 1/1.25
= 80%
= 0.8