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Figure 9.2 Demand Model in Excel
The formula in cell B8 is a calculation of the Overall Cost associated with having different amounts of product in stock. The formula, which is shown in the Formula Bar, is a function of four cells:
Amount Stocked is the amount of product in stock.
Demand is the customer demand for the product.
Air Freight is the cost per unit to ship additional product by air when the demand exceeds the amount in stock.
Expiration Cost is the cost per unit of disposing of unused product when the demand is less than the amount in stock.
If Amount Stocked is less than Demand, then the company has to ship additional units, at a cost of (Demand-Amount Stocked) × Air Freight. For example, if the demand is 8, but the company has only 6 in stock, then it has to ship 8 - 6 = 2 units at a cost of 2 × 150 = 300.
If Amount Stocked is greater than Demand, then the company has to dispose of unused product, at a cost of (Amount Stocked Demand) × Expiration Cost. For example, if the demand is 5, but the company has 8 in stock, then it has to dispose of 8 - 5 = 3 units at a cost of 3 × 50 = 150.
If Amount Stocked is equal to Demand, then there is no shipping cost or disposal cost.
1.
Select Help > Sample Data Library and navigate up one level to the Samples/Import Data folder.
2.
Double-click Demand.xls to open the file in Microsoft Excel.
4.
Click the Create/Edit Model button .
6.
Select Air Freight in the Inputs box and then click the down arrow button .
7.
Notes: 
If the fields in the Create/Edit Model window are not populated when you set up your model, click Choose and select the cell that contains the input or output name.
For inputs, specify the values and click Apply. Inputs must be values, not formulas.

Help created on 3/19/2020