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.
You would be able to insert the currency symbol before the formula in Calculation wizard of the widget field. And then click Show Advanced Options. Please see the screenshot below:
You can also check it on my test form here: http://jotform.com/62442756731963
If you want something else, or need further assistance, please explain the query in more detail. Thanks.