multiplying two numeric data fields


I am working on a page that requires a simple multiplication of 2 fields and has the answer in a third data field.  How to I do this?  I have tried using triggers and variables and had it working I thought, but when I preview it doesn't .  I have a numeric field on one layer (gross amount of paycheck) and on the next layer I have a numeric field for {number of checks per year)  The third field is Gross Annual Income which is where I need the result to display.  Can you help me?

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