How can I have different prices for same product?

Hello, 

here is my question. 

I am working on a form. I want to charge a registration fee among other things through paypal account.

So, I have started that process 

For a single student the registration fee, it is $25. For a family it is $30. I figured out how to do the custom pricing (have 2 options00one for $25 and one for $30), but I can't get the $20 USD to go away above the options. I recreated it and put in 0.00 but then it just says FREE. How can I make that work?

See screen shot for the issue.  

Thank you in advance. I am also needing to use this feature on a few other paypal payment options so I am looking forward to your response :). (for example, different prices for a different amount of classes they sign up for)

You can achieve that result by adding special price options:

You can take a look at our special price guide:

https://www.jotform.com/help/265-What-is-Special-Pricing 

You can test it here:

http://form.jotformpro.com/form/51514636810956? 

If you need further assistance please let us know as we're here to help.