How can I get my totals to show in the Total when a selection is made in my donation selection?

Hi I just got done designing my forms but I am not sure how to get the Total amount selected to show whenever a specific donation amount is selected during the checkout phase. There are 10 stages of donations. Each time a donation amount is selected, I want the totals to show immediately when a selection is made.

I'm thinking it has something to do with the conditional statement but am not sure which conditional statement to select to make it work out. Thank you.

Thank you.

You will need to use the Form Calculation widget, this will help you to get the total from the radio buttons that you currently have in your form and then you will be able to get this value into the payment field, here is the link to this widget: http://widgets.jotform.com/widget/calculation. 

This guide will help you to add a widget to your form:

How-to-Add-a-Widget-to-your-Form

Also, here is a guide that will help you and will provide more information about this: 

How-to-pass-a-calculation-to-a-payment-field

Hope this helps.