I've got a case interview coming up next week and one of my friends told me that this has recently been a common theme of the interview.
I'm quite stuck as to how to approach this though, I'm thinking perhaps I could estimate how many on average people use a paper cup on a daily/monthly basis?
So it'd be [ Population * Average paper cup consumption * Price ].
However, I feel like this would require me to make a pretty vague assumption on the "average paper cup consumption" part, and also this does not really capture the paper cups that are yet to be used. (Eg. Inventory in a cafe.)
I'd appreciate it if you could give me some insights / guide me in the right direction.