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frc50Asked on March 25, 2016 at 11:08 AM
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JanReplied on March 25, 2016 at 11:59 AM
You can use the Form Calculation widget to perform calculation. Please look at this helpful guide: How-to-perform-calculation-in-the-form
If you are referring to the total field in the payment form field, then you just need to turn on the "Show Total" option.
Hope this helps. Let us know if you need further assistance. Thank you.