Not many schools knew Yang Yajing, but almost every class knew Zhou Pengfei. After he said that, everyone was stuck in the classroom during breaks and after school.

Upon finally seeing Yang Yajing, Zhou Pengfei felt as if he had seen a savior and pushed through the crowd to run away.

While running, she shouted, "Yang Yajing! Look what trouble you've caused! I'm so annoyed!"

Those who were fortunate enough to register were satisfied, while those who arrived late were filled with regret, lamenting that they hadn't received the news sooner.

"How many people are there?" Yang Yajing asked Zhou Pengfei.

"I didn't count, but I wrote it down on three sheets of paper." Zhou Pengfei tore the three sheets of paper from his sketchbook and handed them to Yang Yajing.

"You've already taken the money?"

"Take it, take it! A whole bag full of bills and coins! It's so heavy!" Zhou Pengfei gave Yang Yajing a disgruntled look.

"Since you've been doing hard labor and selling your body, I'll give you some reward!" Yang Yajing patted Zhou Pengfei on the shoulder.

"How dare you say that!" Zhou Pengfei glared at her. "How many of those female classmates actually like the Little Tigers?"

"As long as there's money to be made, why are you so concerned?"

"miser!"

"So, you're saying you don't want the benefits?"

"Of course! This is the compensation I deserve!" Zhou Pengfei had probably spent a lot of time with Yang Yajing and had developed a bit of a business mind.

"I'll take the lion's share, you take the small share, I'll give you twenty percent!"

"Twenty percent? What is that?" Third graders haven't learned about percentages yet.

"Study math properly! Otherwise you'll lose a lot of money!" Yang Yajing didn't forget to mock his math skills, "It's like if you get two points and I get eight points, my number is your number multiplied by four."

"Hoo hoo! I'm going to fall asleep! Don't talk to me about numbers! Just give me whatever you think is fair!" Zhou Pengfei felt drowsy whenever he heard about math.

"Hahahaha!" Yang Yajing laughed as she walked out of the campus.

After returning home, Yang Yajing counted the number of people who had registered, and there were more than 390!

Zhou Pengfei was counting money, but the way he counted it was utterly appalling: a huge pile of banknotes and coins of various denominations was stacked together, and he would forget about them as he counted.

"Oh my god! That's not how you count money!" Yang Yajing slammed her hand down on the pile of money.

"Hey! Don't mess it up! We'll have to count it all over again!" Zhou Pengfei exclaimed anxiously.

"Counting money isn't about addition, it's about multiplication!"

"You're giving me a math lesson again?" Zhou Pengfei was on the verge of tears.

"You're going to follow along with me?" Yang Yajing was indeed going to give Zhou Pengfei a math lesson.

He almost failed the last final exam! The boring numbers aren't as interesting as this word problem.

"Put the dozens of one-mao notes in one pile, make them neat. Then put the two five-mao notes in another pile..." Yang Yajing demonstrated the operation, "Each pile is one yuan."

Yang Yajing took a piece of paper and wrote: 1 yuan x 10 = 10 yuan. She told Zhou Pengfei to put the 10 piles together each time he finished.

Like playing a building block game, the two counted the money while Yang Yajing taught him multiplication: 10 yuan x 5 = 50 yuan... 50 yuan x 2 = 100 yuan...

"So, we have a total of 19 piles of 100 yuan each, how much is that?" Yang Yajing continued to tutor.

"Multiplying by 100 means adding two zeros. Adding two zeros after 19 makes 1900 yuan?" Zhou Pengfei saw Yang Yajing nod and suddenly felt incredibly proud! He thought to himself, "Math isn't that hypnotic, is it?"

"What about the others?"

"Seven ten-yuan bills make seven plus one zero, which is seventy! Five one-yuan bills make five yuan... so it's seventy-five yuan. Adding it all up, it's 1975 yuan?"

"You got it right! You get 100 points!"

"Haha! I never thought I could get a perfect score in math!"

"What if we try to reduce costs?"

"Cost? How much?" This time, Zhou Pengfei did not back down.

"Tap recorder 60, subtract it."

Zhou Pengfei did some calculations on the draft paper: "1915?"

"An empty card costs 27 cents, and there are a total of 395 cards. Multiply them."

"Huh? That's so difficult? I can't figure it out!" Zhou Pengfei was completely baffled.

"Shall we do it as an integer?" Yang Yajing thought for a moment. Multiplying three by two, that's something that wasn't taught properly in third grade!

"The integer part of 27 is 30, and the integer part of 395 is 400. Do you multiply 30 by 4 and then add two zeros?"

"Mao? How many times is that pronounced?"

"Twelve thousand cents!"

In this way, after one lesson on addition, subtraction, multiplication, and division, the profit was 848.5 yuan.

"I'll give you 170, but you have to help me with this?"

"One hundred and seventy? More than last time?"

“Hmm! I earn more! Consider it tuition!” Yang Yajing pointed to the large stack of draft paper, making Zhou Pengfei wonder if the tuition was too expensive.

However, he did learn quite a few mathematical calculation methods, and they were the kind of routines that teachers in school wouldn't teach.

Sigh! If this can help me pass my math final exam next semester, then my tuition won't have been wasted.

It took them 45 minutes to sort through one cassette tape. As soon as they got out of school, they went to Yang Yajing's house to work. It took them three days to finish sorting through all forty cassette tapes.

To avoid mixing up people, Yang Yajing bought cartoon stickers and wrote each person's name and class on the stickers with a ballpoint pen before sorting and packing them into boxes.

The two children couldn't possibly carry forty cassette tapes to school, so on the day the tapes were distributed, Uncle Yang's restaurant was packed with people.

It was lunchtime after class, and the aroma of food filled the shop. Many hungry children couldn't resist buying some snacks.

Not only did Yang Yajing receive the money, but the shop also generated revenue! It was a win-win situation!

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