Number of E-Rikshaws in Kolkata
Estimate the total number of e-rickshaws operating in Kolkata using a population-based approach.
Case Statement
Guesstimate the total number of e-rickshaws in Kolkata
Candidate
Sure. By E- Rickshaws we are referring to the typical totos that have become popular in some cities right.
Interviewer
Yes. You can imagine the usual cycle rickshaw. However, this will not be a 2-seater and driven by an electric motor.
Candidate
Alright. I’d like to go by the population approach. Considering the population of Kolkata to be around 50 lakhs. Will that be a fair start?
Interviewer
Okay. Go on.
Candidate
Then I would split the population by the income in the high, medium, low categories with a 20%, 50%, 30% split respectively. In the middle-income category 50% would use public transport and in the low income 60% would use public transport. Thereof, 20% and 10% respectively might go for E- Rickshaws. Next, I’d look into the number of rides and try to arrive at a figure. I’d request you to let me know if I am missing something.
Interviewer
Don’t you think the approach is a bit linear. You can try to consider factors like the demand for this vehicle.
Candidate
Sure. In that case, the population density can be factored in. May I proceed by taking an area of 200 km2.
Background Information
- E – Rickshaw: Typical tuk–tuks (totos) seen in cities these days.
- New replacement for cycle rickshaws in the city.
- Cycle rickshaws are 2 seater and pedal-driven or hand pulled.
- E rickshaws are 4 seater and driver by electric motor.
3000 + 2500 + 1100 + 900 = 7500 E-Rikshaws
Case Tips
- Include the crowding factor.
- No of rides / demand will be higher in areas with higher population density.
- Include multiple factors and make it comprehensive (not a linear approach).
- Basic BQs ( tell me about yourself and why is consulting of interest).