Form plugin with conditional price

Hello everyone, my request place here hoping to get some useful information from someone who may have a similar problem.
In a WordPress site I’m developing I was asked to enter a form with payment option, the payment must be conditioned by products

example:if I select a product from 100 euro whit a radio or a checkbox or a select,and another one from 200 the total will be 300 euro.
All in a single page without e-commerce as woocommerce or prestashop.
unfortunately I do not have pages to post as I have not yet made the form and I’m working in local

For the counterparty Joomla RSForm has this option, but I can not find a wordpress plugin form with this feature.
I do not expect a detailed answer on how to do it,if possible even just a link that can clarify this thing.

Thank you very much for your attention, congratulations for your Work!

Best regards