First of all, you should pay attention: young people who have just entered the society may think that a 15% discount means 85% less money. Ha ha. It's wrong to think like this. Didn't you see the advertisement "10% off for hematemesis clearance"? Isn't that ten percent less money? What do you mean vomiting blood? ! Foreigners don't know much about us in China. China-US table tennis match, China wins the United States, and China loses the United States, all have the same fucking meaning: China won anyway. Foreigners don't understand this.
For example, a pair of leather shoes is priced at 2 10 yuan. Next to it is a particularly eye-catching "30% discount". Then we have to ask: is it a 30% discount? Or 30% off? Or is this marked 2 10 yuan, which is 70% of the original price? Or 30%?
2 10 times (1-30%)?
2 10 times (1-70%)?
Or: "It's only 2 10 yuan anyway"? So, what should the original price be?
If 2 10 yuan is "the price after 30% discount", then the original price should be: 2 10 divided by 0.3, which is equal to 700 yuan. Because 700 times 0.3=2 10 (yuan). He finally vomited blood.