A commodity will be sold after the cost price is increased by 30%. Later, due to seasonal problems, it will be sold at a 20% discount. After the price reduction, each commodity will be sold for 104 yuan, and this commodity will be sold Is to earn or lose? Don't just write the formula, the idea is also written, how to think clearly Thank you!

A commodity will be sold after the cost price is increased by 30%. Later, due to seasonal problems, it will be sold at a 20% discount. After the price reduction, each commodity will be sold for 104 yuan, and this commodity will be sold Is to earn or lose? Don't just write the formula, the idea is also written, how to think clearly Thank you!

Regarding cost price as unit "1",
The price before 20% discount is: 104 △ 80% = 130 yuan
The cost price is: 130 (1 + 30%) = 100 (yuan)
So, now this kind of commodity is sold to earn, earning: 104-100 = 4 (yuan)