My younger brother Lü Fengxian

Chapter 57 Cost of Construction of Dock
While Zhang Shang was calculating and writing, he was muttering something quietly. Lu Yi took a closer look and found that it was the multiplication table that he memorized when he was in elementary school. He couldn't help but feel shocked, as if he had traveled back to the modern times.

"Oh my god, did the multiplication table appear in the Eastern Han Dynasty?"

He quickly began to search for relevant information from the scattered memories left by his predecessor.

"It's actually true!" After a moment, Lu Yi was a little confused after getting evidence from his predecessor's memory.

The Chinese had mastered extremely high levels of mathematical knowledge during the Han Dynasty.

Not only did he have mathematical works like the Zhoubi Suanjing, but he also had the famous Nine Chapters on the Mathematical Art published in later generations.

Otherwise, without mastering certain mathematical knowledge, it would be impossible to build super-large cities like Luoyang and Chang'an, which are now the best in the world, just by word of mouth.

Zhang Shang calculated very quickly and obviously had some knowledge of mathematics. At least he could memorize the multiplication table just as well as Lu Yi from the future.

Soon, Zhang Jia calculated the approximate data.

"My Zhang's fortress is 300 steps on each side, with walls eight feet high and thick, covering nearly a thousand acres. There are 1,800 people in my clan, and the foundation cost is five million coins."

"If we follow my nephew's request, the newly built Lu's Fortress will be able to accommodate 720 people, which is more than five times the size of my Zhang's Fortress. Therefore, each side must be at least 5200 steps, with a radius of 2500 mu. If the wall is still eight feet high and thick, the cost will be at least 3750 million coins. If my nephew insists on building a fortress at the Jiuyuan border, the cost will need to increase by %, at least million coins!"

Zhang Jia spoke eloquently and cited relevant data at will.

Lu Yi nodded when he heard this, and after a quick conversion he immediately understood the data Zhang Jia mentioned.

There were two kinds of mu in the Han Dynasty.

The product of the sides of an acre is 240 steps, which is approximately equal to 461.6 square meters.

The product of the side lengths of a small acre is approximately 192.3 square meters.

Generally speaking, xiaomu is more commonly used, and Zhang Jia was talking about xiaomu at this time.

If it were replaced with the unit of Lu Yi's previous life, the Lu family fortress that needed to accommodate 1000 people would have to be at least 1.85 meters long on a side, with the height and thickness of the fortress walls being meters, and covering an area of ​​one million square meters.

Although the Lu family fortress envisioned by Lu Yi looked large, it was only of medium size in the Eastern Han Dynasty.

If we talk about the largest fortress in the history of the Han Dynasty, it would naturally be Meiwu built by Dong Zhuo.

According to historical records, Dong Zhuo built a fort in Mei, which was seven zhang high and thick, comparable to the city of Chang'an. It was named "Wansui Fort" and was also known as "Mei Fort". Treasures were gathered in the fort, and grain was stored for 30 years. He said: "If the plan succeeds, I will dominate the world; if not, I can stay here until I die."

Dong Zhuo's Meiwu was built by 250,000 laborers, and its city walls were as high and low as those of Chang'an.

Compared with Luwu and Meiwu, it can only be regarded as playing house...

"The eight-foot wall is still too short. Not only can people easily climb over it, but even some strong horses can jump over it. It needs to be made higher and thicker!"

Lu Yi thought for a moment and said to Zhang Jia.

"Jiuyuan is located at the border, far more dangerous than Mayi, so the height and thickness of the wall needs to be increased by 50% based on that of Zhang's Fortress!"

"We need to add another 50% to the wall's thickness? Then it will be more than 12 feet high!"

Zhang Jia was slightly stunned, then started gesturing on the table again.

"Then the cost needs to be increased by another 30%, a total of 50 million yuan!"

Hearing the price Zhang Jia quoted, Lu Bu couldn't help but get a little nervous, and hurriedly said to Lu Yi, "Brother, even if we sell all the horses and furs we brought back this time at the highest price, it will only be less than 3500 million coins. There is still a gap of more than million coins to build an eight-foot high and thick dock. If we use your current standards, it will be a difference of more than million coins!"

"Money is just a possession. If my Lu's fortress is breached, my life will be in danger. Why should I care about money?"

Lu Yi's face was gloomy and he said harshly.

Although this would mean that he would immediately become a pauper again and would have to owe a huge sum of money after finally accumulating some capital, Lu Yi knew that this could not be saved.

Establish yourself and make a living, establish yourself and make a living!
If you can’t even save your own life, how can you talk about dominating the world?

He was determined to build the fortress in Jiuyuan, even if it meant borrowing money!

Fortunately, he now has a caravan of hundreds of carts and the support of four alliances, so his cash flow is very healthy and stable.

The only thing that made him hesitate was that if all the initial money was invested in the construction of the fort, the construction of the equally important cavalry unit would be delayed.

"Are you worried about not having enough money, nephew?"

As if he could see the worry in Lu Yi's heart, Zhang Jia suddenly laughed.

"Oh? Can Zhang lend me the remaining money?" Lu Yi asked hurriedly.

"Ahem, all the money in my Zhang family is tied up in this batch of goods. Even if we sell them all, we can't come up with more than 10 million!" Zhang Jia coughed twice and explained quickly: "What I mean is, this fortress can't be built in a day!"

"The Lu's fortress that my nephew is planning will take at least a year to complete if all the brick and stone materials are available and there are enough craftsmen. The houses in the fortress will take several times more time and money to build."

"Instead of going into debt to build such a huge fort right from the start, it is better to first build an inner fort that is a hundred steps long and wide. After the inner fort is completed, the caravan's dividends will continue to come in. When you have enough money, you can start expanding from the inner fort outwards!"

"wonderful!"

"Wonderful!"

Upon hearing this, Lu Bu immediately praised him repeatedly.

And Lu Yi's frown suddenly relaxed.

He was so concerned that he was confused and had just fallen into a fixed state of mind.

"The Zhang family is indeed worthy of being the first family to build a dock. Uncle Zhang's suggestion is very pertinent. This segmented construction is very suitable for my nephew's current situation!"

"But I wonder how much it would cost to build an inner fortress that is a hundred steps long and wide?"

"My dear nephew, please wait a moment..." Zhang Jia stroked his three-inch short beard proudly, dipped his finger in the tea, and started gesturing on the table.

"If we follow my nephew's standards, a fortress that is 75 steps long and wide, with a wall feet high and thick, will cover an area of ​​ mu and can accommodate people, which would cost coins."

"200 people are a little too few!" Lu Yi thought for a moment and finally set the tone.

"A side length of 100 steps is a bit narrow, so let's set it at 200 steps. Also, since this is an inner fort, defense is more important, so let's just set the height at 20 feet!"

"In this case, the inner fort with a side length of 200 steps covers an area of ​​400 acres and can accommodate 800 people. The cost is 4 million coins. If we add in the additional cost of 50%, the total cost is 6 million coins!"

Zhang Jia did a quick calculation and then quoted the final price.

Thanks to the reader Gaoyangxin for the 100 Qidian coins reward～
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(End of this chapter)