I unaccepted the answer above. After researching for some time, and going through each part of the link at:
https://video2.skills-academy.com/en-us/windows/uwp/monetize/in-app-purchases-and-trials
I am still not able to determine how I set the price of an application.
This is a one-time purchase application - or, equivalently (I think), an application with a single in-app purchase.
I researched the StoreProduct Class, which apparently involves SKUs, which (I think) come with a price. However, the StoreProduct class only has "Get" methods, and I see no way to set the price. I've looked at the submission steps, and I've gone through both .NET code and native APIs for in-app purchase code.
I also see in other sections of the help documentation state the price can be set at submission time, however, that is not correct, at least not for MSI and EXE applications.
I'm currently also working on in-app purchase code, which I believe is the only way to get paid in the App Store. None of that code seems to handle a price, and I see in other documentation that that price shouldn't be hard coded in the application, so I wouldn't expect that to handle the price.