Please SOMEONE help me!!

I want a 4% service fee added to the customer's total payment. Can you help me with the calculations? Thanks

I checked your form, but it cannot work like that.

If you want to have user-defined price + fee calculation, you have to do something like this:

1) Add one more field that will be a user input field:

2) Then calculate the "User defined amount" field and Fee:

3) And pass that calculation to Payment field:

You can check my demo form here: https://form.jotform.com/80546111851956

Let us know if you need any further questions.

Thank you!