Jul 30, 2017 · 1 min read
Hi sudhanshu chopra, that’s not a problem at all. The interviewer is testing your analytical ability and not your knowledge of numbers (though having the basic numbers at your finger tips always helps. You can get those here — Useful Numbers and Formulae for Guesstimates & Market Sizing).
When you have absolutely no idea of what the number could be, you can always put a disclaimer that there is an information gap and you’re going to assume an informed, reasonable number instead while giving the reasons for the assumption.
Hope this helps.
