# EOQ Policy

I have the following problem:

A critical piece of operational equipment contains 30 parts of the same type. The equipment operates 24 hours a day and the critical pieces have a predicted failure frequency of 10,000 hours.

If spares are procured as part of an EOQ policy with: cost per unit of $100, cost of preparation and shipping of $25, an estimated cost of managing an item in inventory of 25% of the inventory value, what is the order quantity and annual costs?

I know:

c = item cost per unit = $100

k = fixed cost per order = $25

h = 25% per year

I need to know:

A = annual demand

since I would use the eqn for EOQ:

EOQ = sqrt((2*k*A)/(h*c))

How do I solve for the annual demand so that I can use the equation above to get the order quantity?

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Probability of each part failing = 8760/10,000 = 0.876

Therefore expected number ...