= + + Īnother way to estimate the cost per user, would be to separate Gmail users between consumers and business people because business users are likely to consume more data and thus be more expensive. Here’s how I would use this information to estimate the cost per user: Equation A: INTERVIEWEE: The main types of costs I see associated with Gmail are infrastructure costs, which would include servers, storage and data transfers development costs to maintain features and updates and marketing costs. INTERVIEWEE: And, would the estimation be for all Gmail accounts, or should it include consumers or business or both? INTERVIEWEE: Should I estimate cost per user for the US alone or the world? Do your results make sense? If not, recheck your equation, assumptions and arithmetic. Calculate the result of each component and compute the result. Write down any assumptions next to the components so you don’t forget to explain them clearly to the interviewer. Break down the equation into components.

Consider edge cases or alternate sources of data and write down any facts that you know will help with calculations. This will eliminate any ambiguity of what should be included in your calculations.

The book Cracking the PM Interview by Gayle Laakmann McDowell and Jackie Bavaro provides a good suggestion on how to structure an answer for this type of question. This product management interview question tests whether you are logical, can explain all your assumptions clearly, are organized in your work, and good with numbers. They are looking for a ballpark number, not an accurate number. In estimation questions, interviewers are evaluating your problem-solving and quantitative skills. QuestionĮstimate how much Gmail costs Google per user per year? Answer Structure Last week, we worked on a product estimation question from Lewis Lin’s book PM Interview Questions. We meet weekly to discuss product management interview questions on product design, product launch, strategy, marketing, pricing, and others.

We think the best way to prepare, is to work through questions and practice mock interviews as much as possible. StellarPeers is a community platform that helps professionals prepare for interviews.

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