"Old Bi even learned how to write letters. Is he treating me as a pen pal?"
That night, Li Yi received a private letter from Bi Goo, the Minister of Revenue. It did not represent the Ministry of Revenue.
In the letter, there were two things.
"On the one hand, he complained that he was poor and said that he had no money. On the other hand, he wanted to give me military funds. What he meant was that he didn't want to give me an IOU."
Li Yi understood. Bi Goo went around in circles and turned the conflict into words.
"He asked me if I should pay taxes on the newspaper? Of course … I can't pay. "Li Yi shook his head when he saw the second thing.
"You can't pay?" Li Chengqi helped to bring the letter over. It was winter, and there were oysters and other seafood to be delivered.
"I can't pay. The newspaper belongs to the education and military. It can provide more money for the relay station and help the people learn to read."
Li Yi refused and gave two reasons.
The newspaper did not belong to him. It was related to the mouthpiece of the Tang dynasty.
"At the same time, I need more money to organize people to do things. No matter how much advertising money the newspaper earns, it will take a long time for the things to be done."
Li Yi had his own plans. He would use the money earned from the newspaper to do other things in the future.
He turned around and said to Li Chengqi, "Brother, before the Yellow River freezes, see if you can freeze a batch of fish and shrimp from Laizhou and send it to Chang 'an."
"How do you freeze it?" Li Chengqi knew that frozen fish and shrimp tasted better than dry ones.
"That's … no, the temperature is not low enough. The water freezes slowly. When the water freezes, the Yellow River will be almost impassable.
You can wait for the weather to get colder and catch fish and shrimp from Bohai Bay. You can bring ice cubes to catch fish and shrimp and freeze them when you catch them.
When you return to land, you can prepare a mixture of ice and water and put the fish and shrimp in. They will be frozen overnight.
Put them in sacks and transport them by land. By then, the weather will be cold and the temperature will be low. The ice cubes will be ice cubes when they reach Chang 'an. "
Li Yi rejected the idea of using water to transport the Yellow River and changed it to land transport.
The cost was high, and there were many rich people in Chang 'an.
"Let me try." Li Chengqi was tempted, mainly because he wanted to eat it.
Then, he pointed at the letter written by Bi Goo. "Compensation for your military supplies …"
"In the future, when you collect taxes, Zhuangzi should also call for rent adjustment. Deduct it from that. You can pay it when it's all deducted."
Li Yi was familiar with such matters. Both sides would gain face, and the imperial court would gain an advantage.
If the military funds were given out now, there would be money left in the form of loans. Every day, there would be quite a lot of money.
Li Yi did not intend to take the money. He wanted the captives. Fifty thousand per captive was already a profit.
As for the giant panda, it was currently a personal hobby.
"That's good too. Write a reply, Brother Yi." Li Chengqi also thought that the Ministry of Revenue had taken advantage of the situation.
Li Yi quickly wrote a reply, telling Bi Goo that he didn't need to pay advertising tax. He also explained how to operate the military fund and handed it over to Li Chengqi.
"Big brother, do you know how to calculate by abacus?" After finishing this matter, Li Yi suddenly asked.
"I know a little, but I'm not good at it." Li Chengqi was a little embarrassed. Obviously, what he knew was true.
"Recently, I have nothing to do, so I looked around. There's a set of mnemonics that can make it more convenient for people to calculate by abacus."
Li Yi smiled, got up, and took out an abacus from the box next to him.
There were two beads on the top and five beads on the bottom.
"In fact, calculating the relationship between weights doesn't necessarily require two beads on the top and one bead on the bottom. It's enough to multiply and divide by sixteen using different calculation methods.
However, addition and subtraction are easier to learn, so there are two beads on the top. One bead represents five, and the other five beads below also represent five.
This way, addition and subtraction are faster to calculate weights. You don't need to learn more difficult methods. "
Li Yi first introduced the use of the beads. The two beads on the top were for beginners. At the same time, it was for larger calculations. The more beads there were, the more positions there would be.
After that, he took out a few pieces of paper with tables drawn on them. He wrote addition, subtraction, multiplication, division, and hexadecimal.
Eleven in hexadecimal was eleven, and twelve was twelve …
"I'm going to print this separately. It will be published in the newspaper, and the rest will be sent to all parts of the Tang dynasty."
Li Yi put the table in front of Li Chengqi.
He personally operated the addition, subtraction, multiplication, and division of the two systems. It was very simple, but his speed was slow.
He was not proficient. He had never learned how to calculate by abacus. He learned how to calculate by abacus in elementary school. Later on, he stopped using it and forgot about it.
Suddenly, he remembered that he had to look up information and ponder over it before he could demonstrate it to others.
"You're teaching such a secret method?" Li Chengqi understood. It was indeed not difficult. Of course, Li Yi only calculated decimals and integers.
Now, in the Tang dynasty, those who played with abacus had their own set of methods, and they would not easily teach others.
At the same time, it also required a deeper foundation in arithmetic. There were questions, and one had to practice according to the solution in the question.
Now that he had drawn tables on a few pieces of paper, he could understand it just by looking at it. After practicing a little more, he could basically do everything.
"There's one more thing that benefits the people. How many catties is one tael? I'll write it now. This is one retractable 625, one tael is 0.0625 catties.
This retractable is calculated only by retractable one place. Otherwise, it will become 0.0625 catties.
Two taels is one tael, two taels is 0.01225 catties. Then, he doesn't need to retract one place.
Three taels is one tael, one tael is one hundred and seventy-five catties. Three taels is one hundred and seventy-five catties on the abacus.
Actually, if you learn the mathematics that I taught in Zhuangzi well, you won't need it at all. Just take out a pen and calculate it. Mental arithmetic is also not a problem. "
Li Yi explained the formula and content of the two pairs of catties on the abacus. He felt that he could do mental arithmetic for ordinary daily life.
However, calculating the compound interest of a donkey's rolling interest would be difficult, unless he knew how to calculate by abacus.
Mental arithmetic by abacus itself was to simulate an abacus in one's mind. It was like playing chess without looking at the chessboard.
Anyone who knew how to play chess could simulate the opening moves in their mind if there were not many moves.
The simplest explanation of compound interest was the stock market. When the limit rose by 10%, it was 10,000 yuan. Multiply by 1.1, it was 11,000 yuan.
On the second day, it was 11,000 yuan multiplied by 1.1, which was 12,100 yuan. On the third day, it was still multiplied by 1.1 …
It was too tiring to calculate with a pen. After calculating for 100 days, his wrist hurt.
As Li Yi thought, he shook the abacus back and forth. Then, he used his hand to draw the beads on the abacus.
"Brother Yi, rewrite it. Give this abacus and method to me. I will practice it tonight."
Li Chengqi saw Li Yi's movements and felt that it was cool.
He planned to learn it first, and then …
The next morning, Li Chengqi's eyes were a little swollen. He didn't have time to use a hot towel to apply it. He hurriedly finished his breakfast and ran away.
He first went to arrange the transportation problem before the Yellow River froze in winter. Then, he sent people to Lai Zhou to try to transport the frozen fish and prawns back.
He wanted the Qidan people in Bohai Bay. The ice there was only thin ice in winter.
After dealing with it, he went to the imperial city to find Bi Goo. He brought the letter.
When Bi Goo saw Li Chengqi, his eyes were on the abacus under his arm.
"Minister Bi, the matter is settled. I will give you a reply." Li Chengqi passed the letter to Bi Goo.
Bi Goo opened it and heaved a sigh of relief. This is a good idea. I can slowly deduct it from the taxes in the future.
After reading the letter, he looked at Li Chengqi. King Song, why aren't you leaving? You still want a reply?
"Minister Bi, do you know how to calculate by abacus?" Li Chengqi shook the abacus and placed it on the table in front of Bi Goo.
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