A Weibo raised this question, and I gave 2 yuan's answer after a simple judgment, which directly led to an argument between my colleagues and me. Although I finally pointed out the mistake in her answer, I still found it difficult. . Out of rigor and curiosity, I searched the information about this problem.

Thanks to Du Niang. . Let me search a lot of information.

Focus on a look, there is a self-proclaimed IBM standard answer, covering the most answers and being topped (helpful to users) the most times. . So based on this answer, let me explain.

answer

1, 9-8= 1,110 =1,1+ 1=2, so I finally earned 2 yuan.

2. At the beginning, there was only 8 yuan, and finally you had 1 1 yuan, so you earned 3 yuan.

There are three transactions in the whole event. Let's take a look at the specific three times. The first transaction: 8 yuan buys, 9 yuan sells, and gains 1 yuan; The second transaction: 9 yuan sells, 10 yuan buys, and the profit is-1 yuan; The third transaction: 10 yuan buys, 1 1 yuan sells for profit 1 yuan; The whole journey:1-1+1=1yuan. There is another way of thinking, that is, if you only have 8 yuan, you can sell it for 9 yuan. When you buy at 10 yuan, you need to borrow 1 yuan, so it is-1 yuan, and then sell at 1 1. . So it is1-1+1=1)

4. You can earn 3 yuan by selling directly at 1 1 yuan, but you finally earn 1 yuan (answer 3), and the actual profit is -2 yuan.

After testing, the enterprise thinks that:

Answering the profit of 2 yuan is definitely an interview loser;

It is even more stupid to answer 3 yuan, because if you don't know what the additional cost is, you will definitely fail;

If you answer 1 yuan, congratulations, it is not within the scope of fools;

As a result, 3 yuan could have made a direct profit, but after three transactions, the total profit became 1 yuan.

So the correct answer is: -2 yuan!

Answer -2 yuan, congratulations! The interview was successful! ! !

Is that really the case?

Let's look at it one by one. . .

The answer 1 is my answer, and it is also the basis of the following argument. . Put it down first

Forget answer 2, everyone knows that this is the stupidest answer, and no one should choose it.

Answer 3. . Seemingly reasonable, the logic seems to have no loopholes, so this once puzzled me, but later I figured it out.

Here the answer provider made a basic mistake.

8 yuan buys 9 yuan to sell, 10 yuan buys 1 1 sells. . There was no problem both times. The problem is. . 9 yuan sells 10 yuan buys. . This transaction is impossible, because you have no chicken in your hand at this time (unless you are short in futures). . Another way of thinking can also prove my statement that 8 yuan bought 1 1 yuan to earn 3 yuan, which is the best scheme, but due to our operational mistakes, we lost 1 yuan profit between 9- 10 (no matter who got this, it has nothing to do with us, but the money is not earned by us and cannot be regarded as it. . So in fact, we only got the profit from 2 yuan (let's talk about the idea of borrowing money first. In 9 yuan, we borrowed 1 yuan to buy 10 yuan's chicken, and sold 1 1 yuan, so we made a profit 1 yuan-debt 1 yuan, so we gained 0 yuan. . But big brother. . Since your debt is 1 yuan, your profit should be 1 1-9=2 yuan, right? Forget it)

Answer 4. . Well, since answer 4 is based on answer 3, the revised answer 3 means that answer 4 has been revised. . It should be-1 yuan.

But is this the real final answer? . . This is just a default thinking of the questioner, that is, assuming the highest value is 1 1 yuan, but what if the highest selling price is 100 yuan? How much is the loss? . Is it 1000 yuan? How much did you lose? . . So this seemingly business-minded final answer is actually the most ridiculous and will only appear in theories and textbooks.

I explain as follows:

1, I'm not trying to attract IBM's attention, nor to improve my popularity. . I am an IT migrant worker. . There is no possibility of any intersection with IBM. . .

I am a big fan of IBM (although I can't afford it yet). . I have loved it since junior high school or high school, at least for more than ten years. I just think IBM is a little ridiculous. . If the answer is really 4, I really don't know how many "smart fools" I have attracted.

I will stay 14 days. In the meantime, you are welcome to hold different opinions. . But malicious abuse is forbidden. . Because you may not be able to scold me. . If you agree with my answer, please copy and paste it in the reply, and I will choose you as the best answer. . I hope to correct some wrong information on the internet.

4. The most important thing: As I said before, I am an IT migrant worker, not a financial professional, nor an enterprise executive, entrepreneur or entrepreneur. . If you have a reasonable rebuttal, please post it and I will choose the correct answer. . Not afraid of shame. . Just ask for the truth. . Please pat the brick hard. . I'll be embarrassed to ask.