A commodity is increased by 20% according to the cost price, and then sold at a 10% discount. The selling price is 270 yuan. How much is the cost price of this commodity? It must be solved by a linear equation of one variable,

Suppose the cost price of this commodity is x yuan,
According to the meaning of the title, X (1 + 20%) × 90% = 270
The solution is x = 250
A: the price of this product is 250 yuan

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