In the Republic of China, there was a shopkeeper Zhao who opened a shop in Baima Town. He was a very shrewd businessperson and had a good plan.

Once, shopkeeper Zhao hired someone to dig sand. He had already recruited enough people, but a few days later, someone still came to sign up. He frowned when he saw this person. This person is a skinny in town, nicknamed Bachelor Chai.

Bachelor Chai smiled and said, "Boss Zhao doesn't know, I've decided to be a new person. This time I wanted to go to a friend out of town, but I didn't entangle him, so I had to come here to dig sand first."

Shopkeeper Zhao knew that what he said was a lie, and after pondering for a moment, he agreed. Although he was not afraid of being a bachelor, he did not want to offend him. This kid was a bachelor, and it was really not small to cause him trouble.

The next day was the first day of August, and Bachelor Chai did not arrive until noon. He smiled and said to Shopkeeper Zhao, "I'm sorry, I drank two more glasses last night, and I didn't wake up until now."

Shopkeeper Zhao was very displeased, but he didn't say anything. After that, Bachelor Chai came every day when the sun was high. It was too late. He was lazy all day, and others were fishing for sand in the river, but he sat on the bank and smoked a hookah. When eating, he ran faster and ate more than anyone else.

On the 21st, after finishing work, Bachelor Chai went to the store to find Shopkeeper Zhao, saying that he did not want to work anymore, and asked Shopkeeper Zhao to settle his wages for him.

Shopkeeper Zhao wanted him to get out of here quickly, so he nodded and agreed. He took out an abacus and calculated three times and five divided by two, and said, "Ten yuan is originally a month's salary, but you only worked for twenty-one days, and one day is calculated according to three points. It should be six yuan, nine cents and nine cents, and I will give you seven yuan!" After saying that, he handed the money to him.

Who knew that bachelor Chai didn't even look at it, and said seriously: "I won't ask for a penny of the money I shouldn't have! Shopkeeper Zhao, you can give me as much as I should get!"

Shopkeeper Zhao was stunned, hey, this guy thinks he gave too much money, the sun is really coming out in the west! He smiled and said, "That's fine, then I'll give you six yuan and nine cents."

"Shopkeeper Zhao, why are you greedy for my hard-earned money?" Bachelor Chai immediately shouted, "I have worked hard for so long, and I have to pay for every cent!"

Shopkeeper Zhao was stunned for a moment, and couldn't help but get angry. He put the abacus on the table: "Then according to you, how much should I give?"

"Don't get angry, Shopkeeper Zhao!" Bachelor Chai had a bad smile on his face. "Others say that you have the most accurate abacus, why can't you even count that small amount?"

Bachelor Chai was not in a hurry. He raised his finger and calculated, "A day should be three-thirds, three-thirds, and three cents. On the 21st, it should be six yuan, nine cents, nine cents, nine cents, nine cents, nine cents, nine cents, nine cents, right?"

Shopkeeper Zhao held back his anger and nodded: "That's right. Rounding to the nearest, seven yuan is just right for you!"

Who knew that bachelor Chai waved his hand: "I don't want any rounding, you can give me as much as you want. Don't want more, don't do anything less!"

Shopkeeper Zhao couldn't help but gasp, Bachelor Chai really came to find fault. He suppressed his anger and sneered: "Brother originally wanted to test me! According to this algorithm, immortals can't calculate a result." Bachelor Chai laughed: "I don't care how you calculate, as long as you calculate not more than one, I will accept the salary."

Shopkeeper Zhao said bitterly, "Bachelor Chai, you don't have to be too proud. I, someone from Zhao, will definitely give you a fair amount!"

"Alright, I'll give you three days. If three days are not good enough for you, I don't want the wages, so I'll take the sign in your shop home and use it as firewood!" After saying that, he swaggered away.

Shopkeeper Zhao sat in the shop and thought hard, scratching his scalp for a while, and making calculations for a while. It's hard to calculate the exact difference.

After dark, he closed half the store and sat alone, lost in thought.

Suddenly, a person stumbled into the street and threw his hands at him: "Shopkeeper Zhao, business is booming, a million gold, give me half a catty of bar."

Shopkeeper Zhao took a look and saw that it was the drunkard Seven Dogs.

Shopkeeper Zhao was annoyed and waved his hand angrily, telling him to go out. However, Qigou refused to leave and sat down at the door. Shopkeeper Zhao was too lazy to pay attention to him, knocking on the abacus and muttering to himself.

Qigou couldn't help but ask, "Shopkeeper Zhao, what are you calculating?Seeing how embarrassed you are, let me help you calculate."

Shopkeeper Zhao's heart suddenly moved. He heard that the seven dogs were also scholars in the past. Maybe he really had a way.

Who knew that when Qigou heard it, he laughed: "Shopkeeper Zhao is so smart, how can he be confused for a while?"

Shopkeeper Zhao's eyes lit up: "Can you count?"

Qigou grinned. "Give me half a catty of wine first, and I'll tell you how to do it after drinking."

Shopkeeper Zhao was dubious, and still filled his broken bowl with wine. After drinking the wine, Qigou wiped his mouth and said, "The day after tomorrow morning, go to the meat shop and ask Sanpi."

Shopkeeper Zhao was taken aback: Sanpi is a pig killer, what are you asking him for?

Seven Dogs laughed and said, "Ask him how many pigs he killed in August, and how many more to kill, that's all."

Shopkeeper Zhao was stunned, ironic. It seems that this guy is just trying to cheat on a bowl of wine. He pointed outside and said, "Let's go, don't bother me again!"

In the blink of an eye, the three-day deadline arrived, and Shopkeeper Zhao's head was broken, and he was still helpless. He was also in a hurry to seek medical treatment. After getting up that day, he remembered Qigou's words and thought that no matter what, he would at least ask.

When he arrived at the meat shop, Sanpi happened to put the pork on the counter. He hesitated for a moment and asked with a red face, "Boss Sanpi, how many pigs did you sell this month?"

Sanpi thought about it and said, "Not counting the current one, I sold seven."

Shopkeeper Zhao asked him again how many more he would sell this month. Sanpi said wait, I'll do the math. As he said this, he pinched his fingers and counted, and said with a smile, "Counting this one, I can still sell three."

Shopkeeper Zhao was moved in his heart and thoughtfully said, "That is to say, you can just sell ten pigs this month?"

Sanpi said: "Yes, this month happens to be ten ruins (ruins, that is, sets, usually one ruins for three days), one ruins, more can't be sold."

The speaker is unintentional, but the listener has the heart. Shopkeeper Zhao's eyes flashed with inspiration, and he was suddenly enlightened, and he couldn't help but laugh three times.

Back at the store, Bachelor Chai just arrived and aggressively said, "Shopkeeper Zhao, it's time, have you figured out my salary?"

"It's clear."  Shopkeeper Zhao took out seven dollars and said, "Your salary is seven dollars, not much, not much."

The bachelor Chai shouted, "It's obviously a little more! I don't want it, I want your sign!" As he said, he was about to take off the sign. By this time, many people from the town had come to see the excitement.

Shopkeeper Zhao shouted: "Slow! More is not much, you let me count it for you. Invite so many villagers to listen, is it reasonable for me to do this!"

Bachelor Chai shouted, "Okay, I'll see how you calculate!"

Shopkeeper Zhao turned around and took a calendar, flipped it over to Bachelor Chai, and said, "August is exactly 30 days, and there are exactly ten market days, right?"

Bachelor Chai nodded blankly, and the others also said yes.

Shopkeeper Zhao said again, "The salary is ten yuan, which is exactly one piece per market. Three days and one market day, you worked for me for twenty-one days, which is exactly the same as the seven markets. I will give you seven dollars, which is exactly not much, not less than a penny!"

Bachelor Chai was suddenly dumbfounded: "This, this... how can you count like this?"

But the people watching the fun had already called out, but this algorithm was the fairest, and neither side suffered a loss. Although bachelor Chai did not want to admit defeat, he also felt that he was out of words, so he had to take the money and squeeze it out in dismay.