"Okay, go ahead and tell me. I'm all ears." Because Jiang Yao was a little distracted when she was cooking before, Mrs. Lu came over to take a look at her.

The two of them sat down around the bed. Jiang Yao carefully spread a thin quilt for Lu to prevent her from catching a cold at night, and then she spoke.

"Mom, if everyone in our village goes to the mountains to pick chestnuts and catch cicadas, the daily demand will definitely be huge. I'm not afraid, because we have chestnuts every day in the inn, but we can't be short of chestnuts."

Seeing that her daughter looked worried, Mrs. Lu also frowned.

"I heard it from your second aunt. I was planning to tell you after dinner, but seeing that you looked so worried, I won't mention it."

"Yes, that's what I meant."

Knowing that Mrs. Lu was really worried about her, Jiang Yao felt warm in her heart and a smile appeared on her face.

"Mom, I've thought about it. The daily output is fixed. I can't keep going like this, right? I plan to open a dim sum shop myself. That way, business will be much easier."

"Daughter, your idea is very good. However, there are not many people in our village, and there are many restaurants. If there are too many, I am afraid..."

Jiang Yao understood that Mrs. Lu didn't say it out loud, probably because she was worried that she wouldn't be able to grab it, because they all had regular customers. But considering her feelings, he still held back.

She winked at Lu with a smile and held Lu's big hand.

"Thanks for the tip, Mom. I can make a batch instead of selling it retail. That way, they can only buy from me, and I won't be competing with them."

“Also, I can provide them with raw materials to prevent them from copying each other.”

"It seems that you have thought of this a long time ago." Mrs. Lu finally laughed again, her eyes full of joy.

"If your sisters knew about this, they would definitely praise you highly."

“Hehe, let them talk a few more words first, and then work with me later. Don’t say it’s hard.”

"Okay, I'll go with you." Mrs. Lu rubbed her daughter's head, feeling a little sore in her eyes and nose.

In order not to lose face in front of her daughter, she talked to her daughter for a while before returning to the house.

The next day, Jiang Yao told her sisters the news. In her opinion, although these sisters were young, they were smart and might be able to give some advice.

In addition, she also planned to use this incident to teach her two sisters arithmetic.

"Yu'er, besides me, you are the oldest of the two of them. Plus, you will be going to school next month. I hope you can learn arithmetic. Are you interested?"

"If sister is willing to teach, Yu'er will definitely study hard." Jiang Yu's eyes lit up. She was really interested in reading.

Not only her, but also her fourth sister Jiang Xin was looking at her excitedly.

"Don't worry, you have to learn these basic math knowledge, otherwise what will you do if you get cheated by others?"

But Jiang Yao didn't think of asking the sisters to do arithmetic problems directly, because they had never encountered such a thing before. The best way was to let them calculate with paper and pen first.

Naturally, she didn't have that much money, so she gave each of them a stick, found a relatively flat place, and discussed with her two sisters how to make money.

"If we open a wholesale store in the future, the price of chestnuts cannot be as high as that of the restaurant. So, we will sell 200 catties a day at cents a catty."

"Ten cents a pound, not counting sugar, white sugar, honey and the like. A pound is thirteen cents. How much do you think you can earn from these two hundred pounds?"

Several sisters frowned, but they were not discouraged. The three sisters all had their own ideas.

But Jiang Yao never expected that the first person to discover this problem was Jiang Xin, and her inference was correct.

Jiang Yao gave her sister an approving look and encouraged her, "Xin'er, can you tell us what your plan is?"

"Okay." Jiang Xin nodded and repeated his calculation steps.

"To know what 200 jin is, you must first know what 1 jin is."

"I haven't learned the method used by the elder sister yet. I can use twenty circles to replace it, and then remove the thirteen circles on the cost, leaving seven circles."

"I remember my mother once told me that for food weighing more than ten kilograms, you have to add a zero in front of it. 0,100 kilograms needs to add two zeros, and 2 kilograms equals seven hundred kilograms. But this time, I got seven hundred coins, which means——"

Afterwards, she turned the three hundred coins into one thousand pieces and four hundred coins, making a total of one thousand four hundred coins.

Jiang Yue and Jiang Xin both realized that their sister did this because their mother had told them their fortunes before.

If they hadn't noticed before, they wouldn't have taken so long to calculate.

Seeing that both of them were reflecting on themselves, Jiang Yao was also very relieved.

Sometimes, it is not a big deal for a person to make mistakes, but the biggest problem is that when one knows that he has made a mistake, he does not correct it or improve himself.

She held one in each hand, deliberately keeping the audience in suspense.

"I have a method that can help everyone calculate quickly. I wonder if you are interested?"

"Yes!" The three sisters agreed immediately and looked at Jiang Yao. Jiang Yao didn't say anything, but just said with a stern face.

"If you want to learn, then that's great. But the premise is that you have to keep this method in mind, don't write it down, and don't tell anyone else."

"Even if he is Second Aunt's Brother Yang, don't tell him. Otherwise, he might be mistaken for a monster and be captured."

Jiang Yao's words were very serious, and the sisters were so scared that they pursed their lips and nodded repeatedly.

Seeing that the sisters were speechless, Jiang Yao began to teach them the formula in a low voice.

“1+1=2,1+2=3,1+3=……”

She said it word by word, and the sisters would repeat it word for word, until their voices became hoarse, and then they finally could say the addition words for tens.

Among the other two sisters, only the third sister Jiang Yue remembered it quickly. However, Jiang Yao was relieved because Jiang Yue was willing to learn from the other two sisters.

Jiang Yao thought that even if she only made chestnuts, she could earn one or two cents a day, and her sister's health was getting better and better, so she was very happy.

However, her sister's medicine had been almost used up. Although she still had some money in her hand, she did not forget to take the medicine to the pharmacy.

Unfortunately, Wei Chengye had been gone for several days and there was still no news, so she had to go to the mountain to look for him alone.

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