PayPal Standard: how to change the price depending on the user's selection.

I am creating a form for my family reunion website. In the form which is questionnaire when the user gets to section where the pick home many adults will be attending and it greater than 1 I would like my payment amount to default to the family price not showing singles rate.

And same for when a user picks 1 it will only show singles price in the payment section.

I can do a condition if attending amount  greater then 1 it will remove the entire payment section not just a price.  Any solution for this?

If I understood correctly, you would like to charge one amount or the other based on the number of adults attending, is that correct?

If that is correct, you would need to:

1) Add a Form Calculation widget which you can hide: https://www.jotform.com/help/434-How-to-Hide-Form-Fields

2) Perform conditional calculations to insert the amount(in the Form Calculation widget) based on the number of adults: https://www.jotform.com/help/268-How-to-Insert-Text-or-Calculation-into-a-Field-Using-Conditional-Logic

3) Pass the "Calculation" value to the payment field: https://www.jotform.com/help/275-How-to-Pass-a-Calculation-to-a-Payment-Field

Result:

Let us know if you need more help.