560÷7=80 copies;

Grade 5 =80×3=240 books;

Sixth grade =80×4=320 books;

2.duo = 100÷(500- 100)× 100% = 25%；

3. Bottom radius = 18.84÷3. 14÷2=3 decimeters;

Bottom area =3. 14×3×3=28.26 square decimeter;

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