谢谢分享！第一题怎么做啊。。。这类东西哪种书上有介绍大家知道吗？
我也要去面一个business intelligence的工作，我还一点sense都没有。。。
我来试试第一题
First we can calculate the actual save of gasoline when using these
technologies. Suppose there are 100 million people driving car A and 100
million driving car B. Every car drives 1,000 mile per month. Then the
gasoline consumption before and after using the new technology is:
car A car B
before 100m*1k/50 = 2 billion gallon 100m*1k/10 = 10 billion gallon
after 100m*1k/75 = 1.3 billion gallon 100m*1k/11 = 9 billion gallon
The numbers suggest using the new tech on car B can save more gas (1b gallon
vs. 0.7b gallon in the case of car A).
But there are other aspects to consider, for example, social impacts, raise
of awareness of saving energy.
We can try imagining what cars A B are like. Car A originally had 50 mpg. It
's an ultra gas-saving car. Car B is a gas-consuming big truck or sports car
. So people driving car A are likely to be those who care about energy,
while people driving car B tend to care less about energy. Also increasing
car A's mpg from 50 to 75, it's a 50% increase. While for car B, 10 to 11 is
only a 10% increase.
So using the new tech for car A should make bigger social influence. You can
proudly say in the commercial that you increase the mpg by 50%, probably
making it the most energy efficient car in the world. In contrast, if you
say you increase the mpg of car B by 10%, the users may not care, since they
mainly care about the horsepower, also since 10% doesn't sound a lot.
In conclusion, using the new tech for car B actually saves more gas. Using
the new tech for car A, on the other hand, can make a bigger social impact.
I think this impact is very valuable. It can make those people who care
about energy very happy. And these people are the leaders in the energy-
saving world. They will talk about this everywhere, and sell this for you
voluntarily. They will persuade their friends to use this new tech, or to
switch from car B to car A, or to save energy in other aspects besides cars.
