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The problem of reducing the price of math problems in the second day of junior high school
If the purchase price is A (cost) and the bid price is 360 yuan, it is (1+80%)a,

So a=360÷ 1.8=200 (yuan), at least 200×( 1+20%)=240 (yuan),

The maximum decline is 360-200× (1+20%) =120 (yuan).

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