Cost per Item/Number of Items Purchased Inquiry

This is an interesting predicament. It really shows how much easier this whole thing is if the process is set up well--ideally the contractor would have the credit calculator from the beginning of construction (perhaps even be responsible for filling it out), and would have been collecting the data in the way you need from day one. It always causes problems when you don't start documenting something until after it's done.Getting off my soapbox now... I can only say that what you're proposing might be accepted, but it's also likely to lead a reviewer to wonder whether the data you've entered is reliable, and trigger a request to see back-up documentation. So you can go ahead and enter it that way now, but be prepared to go back to your contractor for more details (and perhaps even documents validating those details), if the reviewers ask for it.