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.
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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 need to have 2 numbers for that, the first number is the base and the 2nd number is the fixed value.
This basically allows you to switch between 2 numbers, 0 and 100.
Hope this helps!