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Level 6

You can add the value to your check box in the "on" position. 

Click on checkbox 1 and use the "Binding" tab of the Object pallette.  In the ON value box, type 125. 

Repeat for checkboxes 2-4 designating the correct value.

To your numeric field, first set the data pattern to $Z,ZZ9.99. 

Then add the formCalc script:  Sum(CheckBox1, CheckBox2, CheckBox3, CheckBox4)

Let us know if you need more help