"It's just a group of subordinates, why do you bother with a group of subordinates?" At night, Chai Lingyu said to Cheng Chubi.

"It's because it's a group of subordinates that someone cares about them, letting them know that the master is the master, and the slave is the slave." Cheng Chubi said lightly.

Although Cheng Chubi grew up with a new-style education, he has been the idea that everyone is equal since he was a child, but in Datang, if you want to make everyone equal, even if you are a colt, you have to die.

Everyone is equal, what do those landlords do? What do those families do? What does the royal family do? Li Er is the biggest landlord in the Tang Dynasty, and the Li Tang royal family is the largest privileged class, if you want to make everyone equal, isn't that a rebellion? Not to mention that the Li Tang royal family made a move, just the saliva of those scholars who have been exposed to the theory of the Shinong industrial and commercial class since childhood can spray you to death.

In ancient times, people were divided into three, six, nine and so on, and there were strict hierarchies.

The candles in the room flickered and flickered, illuminating the dim room flickering, and Cheng Chubi was sketching on the white paper with a brush.

"What are you drawing?" Chai Lingyu asked with some curiosity.

"Water pump."

"Water pump?"

"Well, a tool that uses atmospheric pressure to squeeze water out, with this tool, you don't have to work hard to draw water in the future, just shake this thing on the rod, and you can directly pump the water up." Cheng Chubi said proudly.

"You're asking for money today, just to get this?" Chai Lingyu looked at Cheng Chubi with some weirdness.

"Yes. I'll get a sample first, if it's easy to use, and then promote it to the whole Datang, think about it, if everyone uses my pump, then I'll really be famous. The smug look on Cheng Chubi's face became even stronger, and it seemed that he would praise me again, praise me quickly.

"The money has always been about six catties, one hundred catties is sixteen catties, ten catties is equivalent to ten taels of silver, and ten taels of silver is equivalent to one tael of gold," Chai Lingyu showed a sneer at the corner of his mouth, and said, "Who can afford such an expensive water pump?" ”

After Li Yuan got the world, he formulated the law of Tang money, stipulating that ten Kaiyuan Tongbao weighed one tael, sixteen taels for one catty, and consistently one thousand pieces of money, that is, six catties of weight, one hundred catties is sixteen pounds, and the consistent money can buy twenty stones of rice, one stone in the Tang Dynasty is about 59 kilograms, and the general rice price today is 3 yuan a catty, one tael of silver is equivalent to the purchasing power of RMB 3540, and sixteen pieces of silver is 56640.

If you change it to a slave, you can always buy a young man or three little maids, and if you encounter a disaster year, a nest head can be exchanged for a slave.

Sixteen runs to build a water pump, only a fool would do that.

"Illiterate! Ignorant! There is no spirit of scientific exploration at all!" Cheng Chubi glanced at Chai Lingyu and said, "This is science, do you know?" Science cannot be measured in money! ”

"Okay, you're right, can you rest now?"

"Yes!"

When he woke up the next day, after breakfast, Chai Hou took a group of blacksmiths and a hundred catties of money to Cheng Chubi.

"Whoever of you can read the drawings, stand up." Cheng Chubi looked at the blacksmiths and said. was asked by Cheng Chubi, and many people were frightened, for fear that they would be punished for doing something wrong.

"Back to the horse, I can understand some of these drawings." A blacksmith said weakly.

"Oh, can you understand this?" Cheng Chubi handed the things he had carefully drawn to the other party, and when the other party saw it, his head hurt.

Because there are some Arabic data on Cheng Chubi's drawing, and it is measured in meters, is it strange that these guys can understand it?

"This ...... What is this thing? The other party asked, "It's the first time the villain has seen these strange things." Please also ask the horse master to explain one or two. ”

"It's Arabic numerals, come on, come on, I'll teach you." Cheng Chubi suddenly had a natural sense of superiority, these turtles, now let you see what modern mathematics is. ”

"This is 1, this is called 2, this is called 3, this is 4, this is 5...... This is a decimal system, one meter is equal to three feet......" Cheng Chubi couldn't help but show off.

After a long time, Fang told these people some of the most basic knowledge, don't think that the ancient people were stupid, in fact, the ancient people were also very smart, and they quickly mastered Arabic numerals and understood what Cheng Chubi was on the map. And at this time, the Chai family's version of Mama Rong was gone, and she didn't know where she went.

"Master Pony, if you build it according to your plan, this hundred catties don't seem to be enough." A leader of the craftsmen stepped forward and said, "If this pump is to be made of copper, this money will not be enough." ”

"Oh? So how much do you think is appropriate? Cheng Chubi smiled faintly, money, there are still a lot of them in the treasury of the princess's mansion, it shouldn't be a problem.

"I think it will take at least about 500 pounds." The other party thought for a while and said.

"How much do you need it?" Cheng Chubi was also a little puzzled, five hundred catties, wouldn't that be eighty? Eighty runs to the next generation, at least 283,200. Although it doesn't seem like much, for many people in Datang, it is already a huge amount of money, and at this time, it can be said that he is a rich man with more than ten dollars in his pocket.

"That's already the minimum." The other party couldn't help but say.

"Then go and get another four hundred pounds. You go and tell Chai Hou, another 400 catties. Cheng Chubi said. Cheng Tian responded, hurriedly walked outside, and went to Mama Chai to ask for money.

However, less than a few minutes after walking out, Cheng Tian came back, with a deep slap mark on his face, and his face was swollen.

"Huh?" Cheng Chubi's eyes couldn't help frowning slightly, snorted coldly, and said, "What the hell is going on?" ”

"Yes...... It's ......" Cheng Tian behaved a little stumbling.

"What the hell is going on!" Cheng Chubi's voice was a little heavier, Cheng Tian was frightened, and knelt directly on the ground.

"Okay, okay, bullying the master's head, they didn't hit you in the face, they slapped the face of the horse! Do you really think that this pony is easy to bully? Cheng Chubi said with a cold smile. I ordered someone to get the money, but the person who went came back with a swollen face, which clearly didn't put himself in his eyes!

It's been a big deal! If you don't give these people a look at it today, they really don't take this horse seriously!

Angry, Cheng Chubi is quite angry! It depends on the owner to beat the dog, Cheng Tian is his own person, and he represents himself, he was beaten in his own home, how can Cheng Chubi not be angry?

Damn!