The two came to the supermarket together, Tian Tian saw the toilet paper on the shelf, so he casually took it and put it in Gan Yiqi's shopping cart, Gan Yiqi picked it up: "Don't shop around, don't you look at anything else?" Tian Tian nodded.

The two came to the toilet paper area, looked at it for a while, and Tian Tian said, "Buy this, right?" This one is the cheapest. ”

"I think it's good to buy this." Gan Yiqi took a piece of paper: "According to the number of grams, the number of rolls, the thickness, and the price, it is the most cost-effective." ”

"Why?"

"You can first multiply the number of grams by the number of rolls, and then divide the price by the product of them to know the price per gram, and you can compare it."

"You're not going to count every single one of them, are you?" Tian Tian looked at the shelves full of shelves,

"You're so good at arithmetic?"

"It's pretty simple, and it's not difficult."

"But it's all three digits multiplied by two digits, and then a two-digit number with a decimal point divided by their product, and you can figure it out just by looking at it?"

"Uh, my mental arithmetic is okay, so this is not difficult." Tian Tian couldn't help but applaud. After buying daily necessities, the two came to the place where snacks were sold, and Gan Yiqi chose a lot of chocolates.

"You love chocolate?"

"Well, I like sweets." Then Gan Yiqi bought a lot of biscuits and instant noodles,

"What are you buying these for?"

"Sometimes I'm too lazy to go out to eat, and it's not interesting to eat alone, so I just eat a bowl of instant noodles to save time." Tian Tian suddenly became angry: "No! It's not good for your health like this, these are very unnutritious, eating it is not good for the body at all, it's okay to eat occasionally, how can you buy so much as a meal? No wonder you look so thin, it's just because you don't eat well! You are not allowed to eat these things in the future, when you go to the competition, you will eat the food prepared by the organizers, eat more, you can't be picky, you can't be hungry, you can eat with me when you go home, I will supervise you. ”

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