Google Interview Question: 1. How much money spent in US... | Glassdoor

## Interview Question

Product Manager Interview Mountain View, CA

# 1. How much money spent in USA per year on GAS

1

I break down to 4 parts . 1. Car , 2 . Household , 3. Transportation , 4 others.
Interviewer replied me to focus on Car only.
I use USA population to answer this questions.
Finally, Interview ask me how do I think my estimation , is that too high or too low.

Interview Candidate on Feb 20, 2015
1

I would first clarify if we are looking at Gas spent on what (car, house, enterprise, etc.). If the question is on Car, then I will proceed to look at the US population first, and then break that down into those that drive (some distribution of age would be useful), and then based on that specific distribution, break further down in terms of driving distance for the specific driving group. (you could probably further look into different types of drivers - stay home mom, people with long commute, people with short commute, older people who drive less than one a day). And then simply multiple the different factors to come up with an estimate.

SuperDuper on Mar 30, 2015
0

I'd think there must be data on how much gas USA buy.

Jane on Sep 18, 2015
0

1. Do we consider both private and commercial (large vehicle - trucks) vehicle for assessment? - say the answer is only private vehcile

2. Even with in private vehicle, do we have to consider people driving the car for personal use or people driving for Uber and Lyft. The consumption of gas will vary based on the usage - say the answer is vehicle for personal use only

Make equation:

Money spent per year on Gas = total gas consumption by private vehicle in a year * price of gas per gallon

Total gas consumption by private vehicle per year = number of private vehicles in US * (average gas consumption per month per vehicle * 12)

Number of private vehicle in US = number of households in US * average cars per household

Number of household in US = total US population/ average person per household

Assumptions and Facts:

1. Gas price = \$3 per gallon

2. Average person per household = 3

3. Average car per household = 1.5

4. Average gas consumption per vehicle per year = 1200 gallon

5. US population = 300 million

Do the Math

Number of household in US = total US population/ average person per household

= 300 million / 3

= 100 million households

Number of private vehicle in US = number of households in US * average cars per household

= 100 million * 1.5 cars per household

= 150 million cars in US

Total gas consumption by private vehicle per year = number of private vehicles in US * (average gas consumption per month per vehicle * 12)

= 150 million cars * (100 gallon per month * 12)

= 150 million * 1200 gallon

= 180 billion gallon

Money spent per year on Gas = total gas consumption by private vehicle in a year * price of gas per gallon
= 180 billion gallon * \$3 per gallon

= \$540 billion
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0

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0

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0

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