Create an estimate from options chosen in form

Hello! I'm trying to set up this form to act as a way to give potential clients a rough estimate once they've chosen the items they want. Like if they want a patio and add a firepit and pergola to it, I want the assigned prices (that they can't see) to add up to a rough estimate so they at least know a ballpark price. What would be the best way to do this?

This is a duplicate thread to https://www.jotform.com/answers/1117444/ which is just addressed. So, we are marking this thread as answered. If you have any questions with this issue, we request you to follow-up on the other thread.

Thank you!  

My bad!