Call in the Cavalry - 2019

Am I allowed to start a Call in the Cavalry thread for the new year? In the spirit of "it is easier to ask forgiveness rather than permission", I'm going to start a Call in the Cavalry thread for the new year.

I do not have the business/financial know how to advise this OP on calculating interest on a payment plan. XIRR() seems like the obvious first choice, but I do not know if it is really applicable to the specific scenario being presented. Anyone with knowledge of such accounting issues contribute some financial expertise?

Edit because, like an idiot, I failed to include the link to the thread in question: https://www.excelforum.com/office-36...ease-help.html