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The math problems in Building A of Grade Three are going to be sold at the price of 5000 yuan per bungalow.
Answer: (1) down 10%, which is the original 10% discount (10% discount).

(2) A is appropriate

Problem solving process:

(1) If the percentage of downward adjustment is x, then the equation can be listed: 5000 * (1-x) 2 = 4050, and x=0. 1.

(2) A: Discount = 4050 * (1-0.98) *100 = 8100.

B: 3,600 yuan.

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