By late May, the sweet potatoes had grown to the size of eggs. Chen Zhuangtou smiled and said to the young man, "If it grows, it is certain that the yield per mu is 2,500 kilograms. The young man has been using the crops for so many years, but he has never seen such high-yield grain."

Young Master thought that it was common for the later generations to produce 6,700,000 kilograms per mu, and more than 2,000 kilograms would be worthy of it. If this sweet potato was promoted in Dayan, it would be a great contribution to the country and the people. Such great contributions are not something that she, an orphan, can afford.

Youfeng asked Qingzhi to go to Lin'an, found Gu, and asked Cheng Jin to come to Jingci Temple.

Cheng Jin arrived at Jingci'an the next day, sweating profusely. The first thing he said to him was, "Jin'er, where is that high-yield thing?"

Youzi asked Cheng Jin for peace, "Uncle, sit down and drink a cup of tea first."

Cheng Jin was a little embarrassed, "Jin'er has grown a lot taller..."

He hasn't seen Youhuan for more than two years. After all, he is his biological uncle and a close relative of blood. He sighed very much. Youhuan still likes this down-to-earth and pragmatic second uncle, so what's wrong with giving him the credit?

Youzi carefully talked about the ins and outs of sweet potatoes to Cheng Jin, and then explained that she had been using Cheng Jin's name to act, so that Cheng Jin must remember not to reveal it.

When he arrived at the farm, Cheng Jin looked at the fruitful sweet potatoes and asked in disbelief, "What is calculated is the yield per mu of 2,500 kilograms?"

Youhua nodded with a smile, "At least that's the case."

Cheng Jin stood there blankly for a long time, and tears were flowing down his face, "God protects my Dayan! With this crop, why don't the people of Dayan have to worry about not having to continue their meals!"

The young man was infected by him and couldn't help but his eyes were wet. His second uncle was really a good official who was worried about the country and the people.

Cheng Jin was going to go to the capital to report to Shangfeng, and Youhua asked him to go to the Qin family business and help him bring a message to Mr. Qin.

On the day Cheng Jin brought the conversation, Mr. Qin rushed to the thatched cottage.

Youzi has not been to the cottage for more than half a month. Old Master Han snorted coldly at Youzi on the back of his head, expressing his anger and dissatisfaction. "You little girl, you really have to hide from me for the rest of your life? I have always exchanged for those poems with calligraphy and paintings!"

Youhua smiled and said, "The old man misunderstood. I am really ashamed of it. I'm sorry to take advantage of it again."

The old man gave an expression like "It would be strange if I believe you."

Youzi knew that he wanted to make another poem, and his eyes rolled, and he said with a smile, "Jin'er made a question for the old man. If the old man could do it, how about Jin'er's poem, how about Jin'er's words?"

Old Master Han suddenly felt insulted and hummed, "The little girl dares to look down on me, so you dare to be so arrogant, and you will say it!" He rolled up his sleeves and wanted to fight.

Youzi said, "Old man, what is the sum from one plus to two thousand?"

Old Master Han said unhappy, "What is this problem? This is better for Mr. Qin to be considered."

Mr. Qin was watching the fun without bothering him. He took out a gold abacus from his arms and handed it to the old man, and said in a slight manner, "You can use this faster."

The old man took over the abacus with a dark face. His abacus was quite profound and he had his own insights on various abacus problems. He had to take the abacus in the imperial examination. His abacus explanation course was most highly praised by students and often made them feel enlightened. Now this little girl actually asked him to plan for abacus. This was what he did when he was a child.

The old man felt deeply humiliated, helpless and itchy about the exquisite poems, so he started to make a plan in aggrieved manner.

Qingzhi whispered to Xiaowu beside her, "Old Master Han really listens to my lady."

Xiao Wu was very embarrassed, but he was powerless to refute. Who made his old man not do anything?

Accompanied by the sound of abacus, Youhua talked about the important matter with Mr. Qin.

Youfeng said, "Mr. Qin should have known that my uncle took over the sweet potato business. Can Mr. Qin see business opportunities?"

Mr. Qin did not think that Youfeng would talk to him about any major matters. He was sensitive to this and said seriously, "Are you saying that the court will promote sweet potato planting?"

"The emperor has been worried about food in the past two years. How can he let go of such high-yield crops now? But we only have twenty acres of sweet potatoes, and based on the output of 2,500 kilograms per mu, we can produce a total of 50,000 kilograms. Even if all these 50,000 kilograms of sweet potatoes are planted, and based on the output of 300 kilograms per mu, we can only plant 160 acres of sweet potatoes. This is a drop in the bucket for the Great Yan Kingdom. If we wait for the breeding of crops in this way, if the Great Yan Kingdom wants to popularize sweet potato planting across the country, it will probably be a few years later. The far water cannot quench the near thirst, and the food crisis in the Great Yan Kingdom is already very serious."

With the clear analysis and calculation of the young man's plan, Mr. Qin's face became cautious and put away his last bit of contempt. "The number of sweet potatoes required for comprehensive planting is very large, and the Qin family's business may be difficult."

"It doesn't have to be done in one step. My uncle and Chen Zhuangtou discussed that as long as the temperature of sweet potatoes is suitable, it is feasible to plant them twice a year. Now it is June, and one season can be planted in mid-July. If you can plant 10,000 acres of sweet potatoes in July this year, you can harvest more than 20 million kilograms, you can plant nearly 100,000 acres in spring next year, and nearly 10 million acres next summer next year. Once harvested, there will be enough sweet potato seeds that are popularized nationwide."

Mr. Qin then calculated, "If 10,000 acres in mid-July requires three million kilograms of sweet potato seeds, the Qin family's business will be easy. It's okay to have more."

When Youyou saw that Mr. Qin had not yet understood his intention, "Is the Qin family businessman an imperial merchant?"

Mr. Qin shook his head. "This is my lifelong intention." The Qin family business is spread all over the country and has strong strength. However, the heads of the family have developed in Jiangnan before, and it was not until his generation that he began to develop northward. His foundation in the capital is still shallow, so how easy is it to become the emperor?

Youhua asked, "If you want to become an imperial merchant, you don't know what you need to clear your relationship?"

Mr. Qin said, "This is probably a bottomless pit. Just climbing alone is probably not something that can be achieved with tens of thousands of taels of silver."

You Feng blinked, "Sir, didn't you think about giving this benefit to the court directly?"

Mr. Qin slammed the table and stood up, "Oh, why didn't I expect this floor!"

Old Master Han yelled, "Qin Maozhi! I've been doing it for a long time in vain!" The old master had already calculated it almost, but he was almost done. He was so scared that he forgot where he calculated it. In anger, he shouted with his name and surname. Maozhi was Mr. Qin's name.

Mr. Qin apologized repeatedly, but the old man refused to forgive him.

Mr. Qin bowed deeply to Mr. Han, "Old Master, the Qin family's business is about to flourish. Mao Zhishi is so angry that he should forgive me. I will help the old man plead with Miss He later."

Seeing that Mr. Qin was solemn, the old man stopped playing tricks, so he asked Xiao Wu to rub his hands that were almost thrusting. He had not planned for decades and became unfamiliar.

Mr. Qin returned to the opposite side of the young man and sat down, and continued, "Miss He has unique insights and is very insightful. Qin admires it."

Yousheng said modestly, "Sir, praise me. You can discuss the specific matters with my uncle. I am a diligent and down-to-earth person."

Mr. Qin thanked him again and said solemnly, "On the day when things are done, Qin must give him a good reward!"

Youxi said, "Waiting for good news from Mr. Qin."

When Mr. Han saw that they had finished talking about the main business, he hummed, "Is the deal finished?"

Mr. Qin bowed to Youhuai, "Please ask Miss He to help Qin again to make up for the mistake just now."

Youhua smiled and said, "It's easy to talk about." He turned to Mr. Han and said, "The old man is too stupid. I can call out the result of this question in one mouthful."

Old Master Han said unhappy, "Come and swear me again. Just call me one and see."

Young man said without hesitation, "One million and five hundred."

Old Master Han was a little disbelief, "I don't know if you're doing it right. Even if it's right, maybe you've calculated it in advance."

When Young Master walked to the desk, Old Master Han consciously grinded the ink. Mr. Qin was stunned by this scene. The dignified President Han actually grinded the ink for a little girl! He also looked very skilled in business. I am afraid that he had done a lot of work before!

The young man first lists horizontally on the paper: one, two, three...one thousand nine hundred and ninety-eight, one thousand nine hundred and ninety-nine, two thousand.

It is also listed in aligned manner below: two thousand, one thousand nine hundred and ninety-nine, one thousand nine hundred and ninety-eight, three, two, one.

After writing these, Youzi couldn't help but silently complain that it was too inconvenient to have no Arabic numerals.

Youzi drew a horizontal line under two columns of numbers and wrote it in sequence: 2001, 2001, 2001, 2001... 2001, 2001, 2001, 2001, 2001.

Also wrote: It is half of it.

Youzi used the derivation process of "Gauss sum", which was presented to them briefly and clearly without any more stingy explanations.

Youhua looked up and asked Mr. Han with a smile, "Did you see that?"

Old Master Han suddenly realized, "This algorithm is amazing!"

Mr. Qin is a businessman and is sensitive to numbers. He is also very good at this algorithm. "In this way, the sum of other numbers can be used to the same extent."

Youth nodded.

Mr. Han was serious about academic research, so he smashed a series of questions and answered them one by one.

Mr. Qin was stunned by the side.

Old Master Han was silent. He suddenly felt like he was a dream. He was a contemporary great scholar and seemed to be just a dream, all of which were illusory. He suddenly seemed to know nothing.

Youzi seemed to hear the heartbreaking voice of Mr. Han, and comforted him, "I got this method by chance. I have been urinating and planning since I was a child. My father forced me to do something, so I took the opportunity to come up with this algorithm. I am interested in math. I have read most of the math books in my father's study. I have been idle in Jingci'an in the past two years, so I have studied it a little more. The old man is a master in literary circles, and he has many problems. Youzi wants to ask the old man for advice, and I hope that the old man will give him advice at that time."

Old Master Han woke up from a trance. He was obsessed with research and was often deeply trapped in it and could not extricate himself. He was like a practitioner who was obsessed with it. He became clear in his eyes and carefully put away the page of paper. "I am obsessed with it again. This kind of math research is different from poetry. Poetry is to cultivate sentiment and express emotions, but math can be used in all aspects, and it has great uses in all aspects such as fortifications, civil, agriculture, military, etc., and is a practical and great question. If He Xiaoyao has new insights, let me talk to me more."

Youzi couldn't help but feel admiration, and felt a little sorry for the old man's pleading in his words, and said seriously, "The old man is in love with the world. If Youzi has any insights, you will definitely come to discuss with the old man. But you shouldn't think that Youzi is showing off your skills, otherwise I won't come."

Old Master Han laughed, "How could he dislike it? The little girl is really sharp-tongued!"

The atmosphere has improved a lot, so I picked up my pen and wrote poems:

The sun is over the mountains and the Yellow River flows into the sea.

I want to see you thousands of miles away and go to a higher level.

The scene of this poem is magnificent and magnificent, making people open-minded and inspiring to be proactive.

Youhua smiled and said, "Give it to the old man."

Mr. Han was not crazy this time, maybe this was due to the active and openness of this poem. "Girl, I will go to Songshan Academy to give lectures next month, so you can go too!"

Youhua smiled and said, "Don't joke, old man, I haven't been to school for a few days."

Old Master Han disagreed, "Don't be as modest as you."

You Xiaoxiao stopped mentioning this matter.
Chapter completed!