Buy chicken and talk about it.

8 yuan bought a chicken, 9 yuan sold it and made a profit. At this time, this person has 9 yuan.

But it costs 10 yuan, so he needs to borrow one yuan. Then 10 yuan, 10 yuan repurchased. Originally, there was no loss, but because I borrowed one yuan, I lost one yuan. ?

Then the chicken with the price of 10 yuan is sold at 1 1 yuan, that is,1yuan-the cost of buying chicken is 10(9 yuan capital+loan) = 1 yuan.

So, mathematically, I earned 1 yuan. Simply put,+1-1+1=1;

Three transaction processes: 8 to 9; 9 to10; 10 to 1 1

Simply put, 8 to 9, make a dollar. 10 to 1 1 earn one yuan.

One * * * two yuan, but because he doesn't have enough money from 9 to 10, he needs to borrow one yuan to buy chickens. ?

So one of the two yuan has to be returned to others, so I only earned one yuan.

But from an economic point of view, 2 yuan is lost. ?

Because he bought directly from 8 yuan and sold it at 1 1 yuan, he could earn 3 yuan. Now, he only earned one yuan, so he lost 2 yuan.

Extended data:

There are three transactions in the whole incident. Let's see which three deals are specific.

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.

So the analysis shows that this person is a fool, because the last two transactions are equal to nothing.

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, the interview was successful! ! !

Wrong view: 6 yuan profit;

The purchase price of chicken in 8 yuan can be up to 1 1 yuan;

In other words, this person should be able to get 3 yuan at the highest in a transaction;

So the first transaction lost 2 yuan's profit;

On the second transaction, he bought the goods at the price of 10 yuan;

Obviously, 2 yuan's money was also lost in the purchase stage;

So this person should have made a profit in 6 yuan through two transactions.

References:

Math problem-Baidu encyclopedia