A supermarket sells a batch of refrigerators with a purchase price of 2500 yuan. When the sales price is set at 3500 yuan, an average of 8 refrigerators are sold every day, and for every 100 yuan reduction in the sales unit price of refrigerators, an average of 2 more refrigerators are sold every day. In order to sell more refrigerators and increase the daily profit by 1000 yuan, what is the daily preferential price?

The original profit is (3500-2500) * 8 = 8000
Then we can calculate the subsequent profit 8000 * (1 + 0.125) = 9000
Then we know to sell one more and reduce the price by 50%
Set X
(8+x)(1000-50x)=9000
The solution is x = 2 or x = 10
You can know the discount price is 3400 or 3000

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