I went to the supermarket to buy toothpaste, visited several supermarkets, and found that there was a supermarket that only cost 3.2 yuan for a toothpaste, and I was sure again and again that it was 3.2 yuan for 90 grams

I went to the supermarket to buy toothpaste, visited several supermarkets, and found that there was a supermarket cold sour toothpaste for only 3.2 yuan, and it was determined again and again that it was 3.2 yuan for 90 grams, and there was a 170 gram of the same model not far from the top but the price was 24.8 yuan.

I went to other supermarkets to compare again, and determined that the 170-gram model in other supermarkets was also 24.8 yuan, but there was no 90-gram one. I decided to go back and buy it, but I wasn't sure if it was a wrong price, so I took 3 boxes and asked the cashier to scan the price for me, and I was sure that it was right.

3 boxes of 90 grams, it's 270 grams, and the total price is only 9.6 yuan, what does the supermarket think?

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