A cash logistics company is sizing the Mumbai market and wants a daily figure in rupees.
Estimate the total cash dispensed by ATMs in Mumbai on a typical day. State assumptions, show the chain, and sanity-check.
100 points, 60% to pass.
Two routes exist and a strong answer picks one and mentions the other as a check. Supply side: number of ATMs in Mumbai, transactions per ATM per day, average withdrawal. Demand side: population, share withdrawing cash in a given week, average withdrawal. Mumbai's roughly 2 crore people with high digital payment penetration is the adjustment most answers miss — this number has fallen over the last decade and an estimate built on 2014 behaviour will be far too high. Sanity-check the total against something anchored, like a plausible share of India's currency in circulation.