Buy eight yuan, sell nine yuan, buy ten yuan and sell eleven yuan. Did you make a profit or lose money?

Suppose this person originally had 10 yuan.

The first time, I spent 8 yuan to buy a chicken. Then, there is 10-8 = 2 yuan money, plus a chicken;

The second time, the chicken was sold at 9 yuan price, so now there is only money 2+9 = 1 1 yuan;

The third time, I bought the chicken at the price of 10 yuan. So, now there is11-10 =1yuan, plus a chicken;

The fourth time, the chicken was sold at the price of 1 1 yuan, so now there is only1+1=12 yuan.

At this time, after four transactions, the original money was only 10 yuan, and now there is 12 yuan, which means that 2 yuan earned money.

Or it can be understood that the first time I bought chicken, I took out 8 yuan from my pocket, because I earned 9 yuan for the second time, so when I bought it for the third time, I only needed to take out 1 yuan from my pocket, plus the 9 yuan for the second time, and one * * * was 10 yuan, so I took out 8+/kloc from my pocket.

Accounting thinking. 8 yuan cost, 9 yuan income, bookkeeping; 10 yuan cost, 1 1 yuan income, accounting; Total cost 18 yuan, total income 20 yuan, profit 2 yuan.

Extended data:

To sum up, there are three main voices:

1, earned a dollar, and eight dollars was the capital. He bought nine dollars with eight dollars and earned one, but when he bought ten dollars, he borrowed one, and when he sold eleven dollars, he only earned one. If he changes the borrowed piece, does he always earn only one yuan?

2. This chicken can be sold for 1 1 yuan, so it is worth the money. I bought it for 8 yuan at first, but it can be sold at 1 1 yuan in the end, so the profit should be 3 yuan, but I only earned 2 yuan in the end, which is not a loss, but I didn't maximize the profit.

3. Quite simply, the cost is 8+ 10= 18, the sales amount is 9+ 1 1=20, and the profit is 20- 18=2.