"The non-deterministic part is turning human instructions ("calculate the NPV over 10 years for X given Y") into Excel."
erm theres an NPV function built in excel.
erm theres an NPV function built in excel.
Exactly!
The LLM just needs to make sure it uses it appropriately. Doing that bit is the non-deterministic part, but the NPV calculation itself is completely deterministic.
This process of deciding what data to put in what column and how to apply NPV to it is non-deterministic. You could choose to put it in column A, or column B or maybe even row 3 - it depends!
The LLM does that part non-deterministically.
Have you ever done anything related to corp finance/valuation in a professional setting? Highly doubt it.