A man bought a chicken for 8 yuan, sold it for 9 yuan, bought it back for 10 yuan, and sold it for 1

If the profit is 2 yuan, it must be a failure in the interview; 3 yuan is even more stupid, because I don't know what the additional cost is, and it must be a failure; 1 yuan, congratulations, you don't belong to the scope of fools; The result is: he could have earned 3 yuan directly, but after 3 transactions, the total profit became 1 yuan.

This question does not test your mathematical skills, but whether you can put "how to get the maximum profit" in the first place in economic activities, and also test whether you can clarify your position in the complex trading process. Before solving the problem, it is important to note that the value of commodities changes in the process of exchange. The issue of cost accounting should be taken into account here, that is, the cost of chickens is not set in stone.

i) The first $8 buy, for him (and for those who are going to trade with him later) the cost of the chicken is $8. Then sell it for $9, at this time you make $1, here it is obvious, there is no doubt.

ii) Note that the next sentence is the key: the person who bought the chicken (let's call it B) bought the chicken for $9, so the cost of the chicken is $9 for B (and for the person who will trade with B in the future), just as the cost of the chicken was $8 when the person (we call it A) bought the chicken for $8 at the beginning.

iii) At this time, A buys the chicken that costs $9 from B for $10, and if we think from B's point of view, B sells the chicken that he bought for $9 for $10, and B makes $1, which is relatively A loses $1.

iv) Now A's chicken was bought for $10, so for A (and for someone who will trade with A in the future), the cost of the chicken has risen to $10 again.

v) In the end, A sold the chicken, which cost $10, to another person for $11 (let's call it C), and made $1 for the same reason as (I).

Then to sum up: (i) when earning $1, +1;(iii) when the loss of 1 yuan, -1;(v) $1, +1. A total of +1-1+1=1 yuan.

So it can be said that guy A has water in his head, and after (i), he has already earned 1 yuan, and steps (ii) to (v) are all in vain, and there is no efficiency.

Let's take a look at it now, the chicken is in C's hands, and he bought it for 11 yuan, which means that the cost of the chicken has risen to 11 yuan now. If A sold the chicken that cost 8 yuan in his hands to C for 11 yuan at the beginning, it would also be possible to achieve the current situation, that is, A could have earned 3 yuan, but now he only earns 1 yuan, so A actually lost 2 yuan in the whole process (that is, he did not get the profit he should have got, which is also a disguised loss).

Lose two dollars in economics and make one dollar in mathematics.

Are you satisfied with the above?

This is an IBM interview question, and there are four algorithms::

8 = 1, 11-10 = 1, 1 + 1 = 2, so in the end earn 2 yuan.

2. At first, there was only 8 yuan for the eggplant, and in the end you had 11 yuan, so you earned 3 yuan;

3, the first transaction, the protagonist loses 8 yuan, Kailiang gets a chicken, the second transaction; The protagonist gains 9 pieces and loses a chicken; The third time he buys and sells, the protagonist loses 10 yuan and gets a chicken; In the fourth sale, the protagonist gains 11 yuan and loses a chicken so the entire GDP (gross domestic product) generated is 8 9 10 11 38 yuan 4 chickens.

4. There are 3 transactions in the whole event, let's take a look at which 3 are the specifics?

The first transaction: buy for $8, sell for $9, profit $1;

The second transaction: sell for 9 yuan, buy for 10 yuan, profit -1 yuan;

The third transaction: 10 yuan to buy, 11 yuan to sell profit 1 yuan;

The whole process: 1-1+1=1 yuan So the analysis shows that this person is a fool, because the last two transactions are equivalent to doing it in vain.

After testing, the enterprise believes that:

The profit is 2 yuan, and it must be the one who fails the interview and swatches the seller;

3 yuan is even more stupid, because I don't know what the additional cost is, and it must be a failure;

1 yuan, congratulations, you don't belong to the scope of fools;

The result is: he could have earned 3 yuan directly, but after 3 transactions, the total profit became 1 yuan.

So the correct answer is: -2 yuan!

The chicken was bought for 8 yuan, and sold for 9 yuan, and Chi Chun earned one yuan. Later, I bought it for another 10 yuan, sold it for 11 yuan, and made another dollar. Liang Zhidan bought and sold in an uproar and made a total of 2 yuan.

There were two trades in total, and the first time was empty.

The second dispatch is 11-10 = 1

So I earned a total of 1+1=2 yuan twice.

The money that goes out is poor: 8 + 10 = 18 (yuan).

The money that can be sold: 9 + 11 = 20 (yuan).

Earn Qingda money: 20-18 = 2 (yuan).

A: Earn a total of 2 yuan.

Buy and sell for two rounds, each earning one dollar, for a total of two dollars.

A person buys a chicken for 8 yuan, sells it for 9 yuan, buys it back for 10 yuan, and sells it again for 11 yuan. Q: How much does he make?

Earned 2 yuan. The solution process is as follows: The total purchase price of the sedan car is:

8 + 10 = 18 yuan (the cost of the buyer's fan training to buy chicken); The total **** is: 9 + 11 = 20 yuan (**chicken's**) Therefore, profit = 20-18 = 2 yuan. Although the title of this question is about buying chickens for a while and selling them for a while, we can treat chickens as different chickens, and buying and buying twice is like buying two chickens, and also selling two chickens, and the total money sold minus the total money bought is the profit.

According to the title, this person can make a total profit of 2 yuan if he regrets it.

Among them, the total purchase** is: 8 + 10 = 18 yuan (the cost of buying chickens);

The total **** is: 9 + 11 = 20 yuan (**chicken's**) Therefore, profit = 20-18 = 2 yuan.

Although the title of this question is about buying chickens for a while and selling them for a while, we can treat chickens as different chickens, and buying and buying two branches of Wanzhou back is like buying two chickens and selling two chickens, and the total money sold minus the total money bought is the profit.

Looking at this question from two angles, there will be two answers: 2 and -1

2 is the answer that everyone can think of, and -1 is because if this person sells to someone who is willing to pay 11 yuan at the beginning, then he will make 3 yuan, and he only makes 2 yuan by selling it like this, so it can be said that he lost 1 yuan.

From a purely mathematical point of view: 1 yuan.

On the other hand, if he directly finds the person who is willing to bid 11 yuan, then he can earn three yuan. So, if you calculate it this way, he actually lost 2 yuan. That is: the answer is -2 yuan.

This is the question of the IBM interview, there are four algorithms -8=1,11-10=1,1+1=2, so in the end earn 2 yuan. 2. At first, there are only 8 yuan, and in the end you have 11 yuan, so you earn 3 yuan; 3. The first time to buy and sell, the protagonist loses 8 yuan, gets a chicken, and buys and sells for the second time; The protagonist gains 9 pieces and loses a chicken; The third time he buys and sells, the protagonist loses 10 yuan and gets a chicken; The fourth transaction, the protagonist gains 11 yuan and loses a chicken So the entire GDP (gross domestic product) generated is 8 9 10 11 38 yuan 4 chickens 4, there are 3 transactions in the whole event, I will see which 3 times? First Transaction:

8 yuan to buy, 9 yuan to sell, profit 1 yuan; The second transaction: sell for 9 yuan, buy for 10 yuan, profit -1 yuan; The third transaction: 10 yuan to buy, 11 yuan to sell profit 1 yuan; The whole process:

1-1+1=1 yuan So the analysis shows that this person is a fool, because the last two transactions are equivalent to doing it in vain. After testing, the enterprise believes that:

If the profit is 2 yuan, it must be a failure in the interview; 3 yuan is even more stupid, because I don't know what the additional cost is, and it must be a failure; 1 yuan, congratulations, you don't belong to the scope of fools; The result is: he could have earned 3 yuan directly, but after 3 transactions, the total profit became 1 yuan. So the correct answer is:

$2! -2 yuan, congratulations! Interview Success!!

Add a time. Yesterday a person, spent 8 yuan to buy a chicken. 9 yuan to sell Lingtian 10 yuan to buy a chicken, 11 yuan to sell.

One person, spend 8 yuan to buy a chicken. Sell it for $9. 10 yuan bought back, 11 yuan was sold, 12 yuan was bought back, and two yuan was lost halfway, how much money did he make?

Two answers: 2 and -1

2 is 9-8=1, 11-10=1, 1+1=2, so earn 2 yuan.

And -1 is because if this person sells to someone who is willing to pay 11 yuan at the beginning, then he will make 3 yuan, and he will only make 2 yuan by selling it like this, so it can be said that he has lost 1 yuan.

I think I made two dollars, I bought it for eight dollars, I sold it for nine dollars, I made one piece, I wanted to buy it for ten dollars, I sold it for eleven dollars, so I made another one, and it added up to two dollars.

I originally cost 8 yuan, sold 9 yuan to earn one yuan, now I have 9 yuan, borrow 1 yuan from the bank, then I only have 10 yuan to buy another chicken, and then sell 11 yuan to earn one yuan, in the end the loan still has to be repaid to the bank one yuan, then only earn one yuan!!

Earned, earned two dollars. Because he bought one for eight dollars, it can be recorded as a loss of eight dollars. If you sell it for nine yuan, you will earn nine yuan, and if you lose eight yuan, you will make one yuan; I bought one for 10 yuan, which can be recorded as a loss of 10 yuan, and the offset of 1 yuan earned is equivalent to a loss of 9 yuan, and the sale of it for 11 yuan is equivalent to a loss of 11 yuan, and the offset of 9 yuan is equivalent to a loss of 2 yuan.

So I earned two dollars.

2', in fact, it is very simple, he can earn 3 yuan on the first transaction, but after the last two transactions, he earns 1 yuan. He lost 2 yuan in this! There is the greatest benefit, why do you want to make the last two transactions, he is here for the exam!

Maximize economic benefits.

8 yuan to buy chicken is the lowest price, 11 yuan to sell chicken is the most.

Then the biggest profit he made from selling chickens twice was 6 yuan.

And he only earned 2 yuan.

So he also earned 4 yuan less.

So he lost $4.

First of all, it's stupid to say that you make 1 yuan or lose 2 yuan, don't you think about it except pasting?

Let the principal n=x, spend 8 yuan to buy a chicken: n=x-8 9 yuan to sell: n=x+1 10 yuan to buy back: n=x-9 11 yuan to sell: n=x+2

Earn 2 yuan in total.

Note: Whether the principal is not enough during the period, borrowing money and repaying it again does not affect the result.

Let the principal n be only 8 yuan: n=8 8 yuan to buy chicken: n=0 9 yuan to sell:

n=9 Borrow m yuan: n=9+m 10 yuan to buy chicken: n=m-1 11 yuan to sell:

n=m+10 m yuan repaid now: n=10 the last 10 yuan minus the first principal of 8 yuan = 2 yuan earned).

Then the original intention of the questioner is: Originally, 8 yuan was bought, and 11 yuan was sold to earn 3 yuan. However, because he only earned 2 yuan after 2 trading transactions, it was counted as a loss of 1 yuan.

Personally, I think the questioner's explanation is very boring, since you can buy 8 yuan and sell 11 yuan to earn 3 yuan, then the maximum profit of 2 transactions can earn 6 yuan, so should you also think that 6-2 is a loss of 4 yuan? )

In addition, let's talk about another answer that someone pasted:

4. There are 3 transactions in the whole event, let's take a look at which 3 are the specifics?

The first transaction: buy for $8, sell for $9, profit $1;

The second transaction: sell for 9 yuan, buy for 10 yuan, profit -1 yuan;

The third transaction: 10 yuan to buy, 11 yuan to sell profit 1 yuan;

The whole process: 1-1+1=1 yuan.

So the analysis shows that this person is a fool, because the last two transactions are equivalent to doing it in vain. )

This answer is obviously wrong, according to you, after the first transaction is completed, the chicken has been sold for 9 yuan and the profit is 1 yuan, and the second transaction starts and the chicken is sold for 9 yuan? Don't you think you've sold the chicken twice here? Similarly, the buy calculation between the 2nd and 3rd times is repeated, resulting in an additional error (-1) in the result, making a profit 2 a gain 1 }

This is the question of the IBM interview, there are four algorithms -8=1,11-10=1,1+1=2, so in the end earn 2 yuan. 2. At first, there are only 8 yuan, and in the end you have 11 yuan, so you earn 3 yuan; 3. The first time to buy and sell, the protagonist loses 8 yuan, gets a chicken, and buys and sells for the second time; The protagonist gains 9 pieces and loses a chicken; The third time he buys and sells, the protagonist loses 10 yuan and gets a chicken; The fourth transaction, the protagonist gains 11 yuan and loses a chicken So the entire GDP (gross domestic product) generated is 8 9 10 11 38 yuan 4 chickens 4, there are 3 transactions in the whole event, I will see which 3 times?

The first transaction: buy for $8, sell for $9, profit $1; The second transaction: sell for 9 yuan, buy for 10 yuan, profit -1 yuan; Third Transaction:

10 yuan to buy, 11 yuan to sell and profit 1 yuan; The whole process: 1-1+1=1 yuan So the analysis shows that this person is a fool, because the last two transactions are equivalent to doing it in vain.

After testing, the company believes that: Those who answer that the profit is 2 yuan must be the failure of the interview; It is even more stupid to answer 3 yuan, because I don't know what the additional cost is, and it must be a failure; Those who answer 1 yuan, congratulations, you are not in the scope of fools; The result is: he could have earned 3 yuan directly, but after 3 transactions, the total profit became 1 yuan.

Wrong view: 6 yuan profit The purchase of chickens is 8 yuan, and the maximum can be sold for 11 yuan That is to say, this person should be able to raise up to 3 yuan in a transaction So the first transaction lost 2 yuan of profit And the second time he traded, he purchased with 10 yuan ** Obviously lost 2 yuan in the purchase stage So this person should have a profit of 6 yuan in two transactions.