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20 12 detailed explanation of 29 math problems in Bazhong senior high school entrance examination
Solution: (1) y = (x+10) (200-10x),

That is, y-10x2+10x+2000, where 0 ≤≤≤≤12;

(2) When x=5 (satisfying 0≤ x≤ 12), the maximum profit can be obtained every month.

That is, the highest monthly profit is 2250 yuan.

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