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1 2. [15] Total cost (in millions) is estimated as C = 0.0008 SL}, where SL represents the service level. For example, when SL is 75%, cost is calculated as 0.0008 753. a) What is the cost (in millions) when the probability of stockout is 25%? b) Calculate marginal cost as a function of the service level. c) Calculate the marginal revenue as a function of the service level