Combo Box Choice Calculation


Combo Box Choice Calculation
I have 3 fields. 
Field 1 is a combo box that provides the choice BZ7 or BZS.
Field 2 is a text box (Monthly Gross) that calculates another boxes "Base Salary" * 26 pay periods for BZ7.  I want it to be set up so that If i choose BZS that calculation will change to 24 pay periods and for BZ7 the 26.
You can set these numbers as the Export Values for each of the options in the combo-box, and then simply use the built in Product calculation option to multiply the value of the combo-box with the "Base Salary" text field.
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