If an air conditioner is sold at a fixed price, it can make a profit of 400 yuan. If it is sold at a 20% price reduction, it can also earn 80 yuan. That's the cost of the air conditioner

If the cost of air conditioning is X Yuan and the price of air conditioning is y yuan, then (1) y = x + 400 (2) x + 80 = (1-20%) * y is: x + 80 = (1-20%) * (x + 400) x = 0.8x + 320-80 x = 0.8x + 240 0.2x = 240 x = 1200 y = 1200 + 400

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