Hey Markymark!
Yep, you can do this in the advanced logic settings under “branching and calculations.”
I made a quick demo to show you how to set the logic - > HERE
Essentially, you’ll set up the logic to do this:
- ADD # of cars to @price
- Multiply @price by 100 (if the cost is $100 per car)
This will begin tallying the cost under the @price variable which is added automatically when a payment question is added to the form. You can always recall info from a previous question or from your price variable to personalize the form for that particular user. Here’s more on recalling information.
Hope this helps!