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led: Exam $2$

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A parts supply store orders a particular item on a weekly basis. The weekly demand is $30$ units with a standard deviation of four units. The holding cost is $$5$ per unit per week and a $90\%$ in$-$stock probability is desired. What is the store's weekly holding cost per unit for this item if lead time is three weeks?

Multiple Choice

$$16\mathrm{.}71$

$$50\mathrm{.}12$

$$100\mathrm{.}24$

$$501\mathrm{.}20$