How to remove and clear the calculated value on the field using Calculations

3) We have some simple math calculations going on in this form... however, if they have selected on part of the form list already, but then go to the first question and swap to a different plan, it doesn't remove the current calculation (because it is still selected in the radio buttons that were just hidden and swapped with a different list because of the 1st choice question).  Is there any way to get that reset if someone were to change their mind in the middle of filling out their form?  I'm drawing a blank on how to do that...

Got to Settings>>Form Settings, click on the "Show more" button, then scroll down, and select the "Clear on being hidden" option for the "Clear Hidden Field Values" setting:

Open a new thread if you need anything else, we will be glad to assist you.