Xinhua shopping mall sells some refrigerators at a price of 2500 yuan per unit. Market research shows that when the selling price is set at 2900 yuan, an average of 8 refrigerators are sold every day, but they are not sold in the market

Reduce the price of each refrigerator by $x $y, and increase the daily profit
List function formula:
Y =（2900-X-2500）*（8 +4 x/50）
Finishing, also
Y = - 2x ^ 2 / 25 + 24 + 3200
So y = 5000
-2X ^ 2/25 +24 +3200 = 5000
Finishing, also
/> X ^ 2-300X 22500 = 0
（X-150）^ 2 = 0
X = 150
Price = 2900 - 150 = 2750 yuan
The price of each refrigerator is 2750 yuan

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