What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
For your dropdown items and radio buttons, you need to assign calculation values to them, aside from what is currently displaying on the form. Here is a guide on how to add calculation values on to your fields: https://www.jotform.com/help/301-How-to-Assign-Calculation-Value
Next, on your form calculation field, set the formula which fields you want to add. Next modify your Paypal field to get the value from the form calculation field. This way every selection made by the user shall be added to the Paypal field. You can check this guide for more information on how to make it happen: https://www.jotform.com/help/275-How-to-Pass-a-Calculation-to-a-Payment-Field
Once properly done, it should fill the Paypal field with the proper amount on your form. If you need assistance, please do let us know.