How much money did I lose in total? Smart Miss Linlin, can you answer this question for me?" Brother Li asked.

"I can give you one minute to think. After five minutes, if you still can't answer, then he will count you as a failure!" Brother Li said with a smile.

"Tch, it takes five more minutes to answer a question of this level? Our family, Chenchen, can do it all!" Linlin said she didn't care. A three-year-old can answer such a simple question, but you still give it to me? You're too stupid

Are you looking down on people?

"Tch, if you can't do it, then you can't. Why are you throwing the blame to Chenchen?" Brother Li rolled his eyes at Linlin.

"I'm serious, a three-year-old can know the questions you asked. If you have the ability, don't ask a three-year-old like this. You give me the same questions as a four-year-old!" Linlin expressed disdain.

"If you admit that you don't know how to do it, then I'll give you another question. That's what you say." Brother Li was interrupted by Linlin before he finished speaking.

"Chenchen, come on, come on!" Linlin called Chenchen over.

"Are you serious? You won't really let him do this question, right? He is just seven years old. Even if he has studied for the Mathematical Olympiad, he has not learned so deeply at this stage!" Li

When I saw it, Linlin really called Chenchen over and said in surprise.

"I've told you, Chenchen is very smart. There is no problem at all if you leave such a simple question to Chenchen!" Linlin said very confidently. As for Chenchen's IQ, Linlin is still

Very understanding!

"Uncle Li, what are you talking about? What kind of questions are you asking? I haven't started school yet, can you not let me do the questions?" When Chenchen heard this, he was frightened. I haven't set off enough fireworks yet. You guys haven't set off enough fireworks yet.

Do you want me to go home and do the questions?

The nature of children who loves to play and hates studying is clearly reflected on Chenchen’s face!

"No, uncle is giving you a puzzle. If you can answer it, then uncle will give you this whole box of fireworks, okay?" Brother Li said softly.

"You can have this! Uncle Li, tell me!" Chenchen said very obediently.

"The question is like this. Suppose I am a shoe seller." Brother Li just said this when he was interrupted by a question from Chenchen.

"What? Uncle Li, are you a shoe seller? Where do you sell shoes? By the way, when we went to the mall today, we forgot to buy shoes. Tomorrow you take me to your store to help me choose a pair.

Are the new shoes good?" Chenchen's question directly made Linlin and Brother Li laugh!

"Pfft! No, it's not that uncle sells shoes. Uncle doesn't sell shoes."

"Uncle, if you don't sell shoes, can't you buy me a pair of shoes?" Chenchen interrupted again.

Brother Li’s topic!

"Chenchen, this is impolite. You can't ask others to buy things for you, you know? If you have something you want, you should study hard and get it through your own efforts. Do you understand?"

Linlin said seriously.

"I know, mom!" Chenchen replied.

"It doesn't matter. If you call me daddy, I will buy you new shoes tomorrow. What do you think?" At this moment, Brother Li had a sudden idea. He didn't know what kind of reaction this little guy would have!

"No, I don't want to call you dad. I already have a dad. Although he is far away from me, I only have that one dad. Besides, aren't you my uncle? Why did you let me call you dad?" Chenchen

Linlin's face instantly turned ugly after her words.

"It doesn't matter, little kid. Even if he calls me uncle for the rest of his life, I won't mind. I will take good care of you two for the rest of our lives!" Brother Li touched Linlin's head, and Linlin's expression changed.

Relaxed a bit.

In fact, Brother Li does think so. He doesn't care what Chenchen calls him, how Brother Li treats him, how his relationship with Brother Li will be in the future, and how he calls Brother Li. It doesn't matter at all.

relationship, when Chenchen grows up, he will understand everything!

"I promise you, I'll buy you new shoes tomorrow, okay, but you have to answer my question correctly. Do you think it's okay?" Brother Li said.

"Okay, Uncle Li!" Chenchen said happily.

"Then I will continue with the question. Don't get too serious with me. Suppose I am a shoe seller. The purchase price of a pair of shoes is 45 yuan per pair. However, due to the change of seasons, these shoes are not easy to sell.

But I didn’t want to overstock my shoes until next year, so I decided to sell them at a loss of 30 yuan per pair! But just yesterday, a customer came to me and bought two pairs of shoes, and he gave me a 100-yuan ticket.

Since I didn’t have any change here, I went to the owner of the neighboring store to exchange 100 yuan in change, and then gave the customer 40 yuan! Originally, I thought the matter was over like this, but afterwards the owner of the neighboring store discovered that,

That 100 yuan bill turned out to be a counterfeit currency. In desperation, I had no choice but to pay the owner of the neighboring shop another 100 yuan! So the question is, how much money did I lose in total? Smart Chenchen, your mother

But I said, you know how to answer this question, then you can." However, before Brother Li could finish speaking, he was interrupted by Chenchen.

"Uncle Li, you are so stupid. You can't even calculate such a simple account. It seems that you are not suitable for business! You lost a total of 130 yuan. You still want to stump my mother with such a simple question.

You are so naive!" Chenchen said.

As soon as Chenchen said these words, Brother Li was stunned!

Damn it! When I saw this question, I still had one minute to calculate it, and you guy just gave me the answer in seconds? How is this possible? Isn’t this incredible? You are only seven years old, you

What did you eat when you were growing up? No wonder your mother takes everything in her mind, so she puts all her energy into you!

"How's it going, Uncle Li, did I get the answer right?" Chenchen asked.

"Yes, you got the answer right! But how did you get it right? Can you tell me what you think?" Brother Li asked.

"It's very simple. In the whole process, there is nothing to do with your neighbor. It is impossible for your neighbor to make money or lose money from you in the two exchanges of money with you. There is no profit at all between the two of you.

The relationship with loss, that is to say, how much you lose depends on how much money the shoe seller ultimately makes. How much he makes is how much you lose. So if you want to know how much you lose,

All you need to do is calculate how much money the shoe buyer earned! If I were the shoe buyer, wouldn’t I have to buy shoes tomorrow? I bought two pairs of shoes with counterfeit money, which means I didn’t spend anything

I bought two pairs of shoes at a reasonable cost, and I also got the 40 yuan you gave me in change. You bought these two pairs of shoes for 45 yuan a pair, and two pairs are 90 yuan, plus the change you gave me.

Isn’t my 40 yuan 130 yuan? Uncle, you are so stupid, you can’t even do such a simple calculation!” When Chenchen explained his answer to the question to Brother Li, he accidentally hit this

Future father-to-be!

"Awesome, you are really awesome!" Brother Li gave a thumbs up to Chenchen!

At the same time, Brother Li looked at Linlin again, intending to praise Chenchen for being really smart!

"Then let me ask you next, why do you use the figure of 45 yuan for a pair of shoes to calculate? Do you know that this pair of shoes is worth 45 yuan? You only know that this pair of shoes sells for 30 yuan, shouldn't you use 30 yuan for a pair of shoes?

Do you want to calculate the price? In the end, it is 30+30+40100. Your uncle and I finally lost one hundred yuan! Actually, if you think about it differently, what you said before is correct. There is no debt relationship between me and my next door neighbor.

How much money you make is how much money I lose. Obviously, we are in equal exchange. You gave me one hundred, and I gave you one hundred, but the one hundred you gave me was fake.

The one hundred yuan I gave you was real, so I should have lost one hundred yuan in the end, isn’t that right?” Brother Li asked.

"Uncle Li, you are not suitable for business! Aren't we doing a question? What does this have to do with knowing how much a pair of shoes costs? Your purchase price for this pair of shoes is 45 yuan. You will lose the money after you give it away.

45 yuan, is it possible that someone else gave you 30 yuan and you wouldn’t pay it back? So you can’t use the price of a pair of shoes at 30 yuan to calculate it! In addition, it’s true that you lose as much as I earn, and it’s true that

I gave you a counterfeit coin, and you gave me a real coin. However, the money you finally lost and the money I finally earned were not just a hundred yuan! How much did I earn? I earned two

The 90 yuan for a pair of shoes and the 40 yuan you gave me. You shouldn’t calculate the value of these two pairs of shoes based on 30 yuan. The number 30 yuan is just what you set for me. Is it possible that you set the price for me?

If it’s free, wouldn’t you lose money? Because no one of us has to give money to the other, and no one has to ask the other for money! This is wrong. Even if you price this pair of shoes as free, you still lose 90 yuan, because this

You bought these two pairs of shoes for 90 yuan! If you sell these two pairs of shoes to me for a total of 10 yuan, do you still have to pay a hundred yuan? No, in that case, you should pay the compensation.

180 yuan is right, because two pairs of shoes are worth 90 yuan, and you gave me 90 yuan in change! If you price two pairs at 20 yuan, you will lose 170 yuan, and if you price two pairs at 90 yuan, you will lose 100 yuan

Yuan! Could it be said that how much money you lost depends on the selling price you defined for this pair of shoes? No! How much money you lost should depend on how much you bought the pair of shoes, plus

How much change did you give me!" When Chenchen taught Brother Li how to settle accounts, Linlin listened and laughed.

"Okay! Okay, since you are so good at settling accounts, I will buy your shoes tomorrow. I will give you money tomorrow and you can buy them yourself. I want to see if you know how much money you should get back! Okay.

Come on, go play!" Brother Li hurriedly sent Chenchen away.

"Pfft, how about Brother Li? Doesn't it feel good to have Chen Chen press your IQ to the ground and rub it? Do you know? When Chen Chen gave you a lecture just now, it seemed like a teacher was teaching students, hahaha! It's really

You made me laugh so hard!" Linlin finally couldn't help but burst into laughter.

"This kid's anti-interference ability is really strong. I didn't expect that I misled him so much and didn't lead him to the ditch in the end!" Brother Li admired him from the bottom of his heart.

In fact, there is a point of confusion in this type of questions, that is, the same amount of money is mistakenly calculated twice! When calculating this kind of questions, you must sort out the ins and outs of each amount of money. You must not calculate it twice, or even

three times!

At first glance at this question, Brother Li lost money on two pairs of shoes, which is 90 yuan, because the purchase price was 45 yuan a pair. Then, Brother Li gave the customer 40 yuan in change because the customer gave him 100 yuan.

Brother Li sold it at 30 yuan, so 1006040, which means that at this moment, Brother Li has lost 90+40130, and at this time the neighbor of the next door shop came to find

When he came, he said the money was fake, so Brother Li gave his neighbor a real 100 yuan coin as compensation. In other words, Brother Li lost 130+100230 yuan!

right?

wrong!!

At this time, someone will definitely stand up and point out Brother Li's flaw, that is, you only calculated the part of the money you spent, but you haven't calculated the 60 yuan you just pocketed! You really found it.

You gave the customer 40 yuan, but you took the 100 yuan from next door. In addition to giving the customer 40 yuan, you have 60 yuan left! Don’t you count this 60 yuan? In other words, you

Shouldn’t the final loss be 23060170? You can’t just count the expenses and not the returns!

So the question is, is Brother Li’s final loss of 170 yuan correct?

wrong!

This is the result of errors caused by double counting of the same amount of money!

Let’s think about it differently. Brother Li didn’t have any change in his hand at the time, so he had to temporarily borrow 100 yuan in change from his neighbor (which was equivalent to exchanging it with counterfeit currency), and later returned 100 yuan to his neighbor. There was an equal exchange between him and his neighbor, and he borrowed and repaid the neighbor.

, there is no question of who loses and who gains, right? So looking at the entire transaction process, it seems that there are three parties, but it is actually two parties. There is no neighbor at all. He just lent 100 to Brother Li.
To be continued...