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The only formula you need is to be as structured as possible in your responses. That is, approach every problem with a MECE framework. “I would consider these three points”, and say them succinctly. Hierarchical responses are better than laundry lists of points. Eg 1a,1b,1c,2a,2b,3a, and 3b as opposed to points 1-7.
Mentor
You’ll probably want to at least understand the concept of “Payback Period” and how to calculate it (especially when comparing alternatives).
Mentor
Definitely payback period
Rule of 72
In general, if you’re smart and structured, that’s enough.
You won’t get rejected for saying “what’s the formula for this?” Once you get to the actual computing.
We hire MDs and PHDs with 0 business knowledge.
You won't need any formulas beyond the basics of profitability and simple payback. No way you're calculating NPV by hand during the interview.