how to use a constant in excel
Using the Name tool, you can define a constant, such as a tax rate, that you frequently use in Excel formulas. Go to Insert | Name | Define and type a nameTaxRate, for example. In the Refers to area, type the constant value and click on OK. For a 7 percent tax rate, you would enter 0.07. Now you can write a formula like =SalePrice*TaxRate and Excel will use the constant value you defined for TaxRate.