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The seventh grade mathematics gold medal answers to each subject page 40-45.
If the old school building is demolished, the new school building will be 3 χ+ 1000 ㎡.

Then the total area of the school building after planning is 20000-χ+3χ+ 1000m2.

20000-Χ+3Χ+ 1000-20000=20000×20%

Χ= 1500

Cost =1500× 80+5,500× 700 = 3,970,000 yuan.