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3 February, 17:30

During the next four months, a customer requires, respectively, 600, 800, 1,200, and 900 units of a commodity, and no backlogging is allowed (that is, the customer's requirements must be met on time). Production costs are $80, $100, $105, and $90 per unit during these months. The storage cost from one month to the next is $20 per unit (assessed on ending inventory). It is estimated that each unit on hand at the end of month 4 can be sold for $60. Assume there is no beginning inventory. Determine how to minimize the net cost incurred in meeting the demands for the next four months.

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  1. 3 February, 17:45
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    Minimal Net cost: $ 335,000

    Explanation:

    In order to minimize net costs, the first step is to obtain the unitary cost including all the concepts: production + storage

    The period with lower production cost is Month 1 ($ 80), and after adding storage cost ($ 20) it sums $ 100.

    The second Month is the next convenient one in terms of production costs ($ 100).

    However, is not convenient to produce the whole demand in this periods because the extra stock remaining will increase storage expenses, specially considering that storage cost is accumulative ($ 20 per unit per each end of month).

    Remaining inventory after Month 4: not efficient, as $ 60 does not cover production cost.

    Therefore, the best option is:

    Month 1 : to produce from 600 up to 1,400 units

    Month 2 : to produce from 0 up to 800 units, according to Month 1 production (formula = 1,400 less Month 1 production)

    Month 3 : 1,200 units

    Month 3 : 900 units.

    Net cost: $ 335,000

    *Optionally, it is correct producing 600 u in Month 1, and 800 u in Month 2: the result is the same (Month: 1 $ 80 + $ 20 = Month 2: $ 100)
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