Estimation question

Estimate the number of cups of tea consumed in Bengaluru on a typical day.

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What this question tests

Estimation using cultural consumption habits, converting population and per-capita frequency into a daily volume.

Estimate Bengaluru's population, roughly 13 million including the metro area.
Estimate what fraction of that population regularly drinks tea, say 70-80%, given tea's role in daily routine in the region.
Estimate average cups per tea-drinker per day, say 2-3 cups, accounting for home, office, and street-stall consumption.
Multiply population times tea-drinker fraction times average cups per day to get total daily cups.
Sanity-check the order of magnitude against known per-capita tea consumption figures for urban India.

States each input as a labeled, round assumption, population, adoption rate, cups per day, rather than a single guessed final number.
Separates home consumption from street-stall and office consumption, since both are significant channels in Bengaluru specifically.
Lands on an order of magnitude, tens of millions of cups a day, and explains why that's plausible given the population base.

Assuming 100% of the population drinks tea daily, ignoring coffee's strong regional presence in Bengaluru specifically.
Skipping the per-person frequency assumption and jumping straight to a population-sized guess.

How would this estimate change on a rainy day versus a dry day?
How would you break this down between home-brewed tea and tea bought from street vendors or cafes?