Cylinder bored through by holes: volume removed or remaining

1. A.
   $16\%$
2. B.
   $20\%$
3. C.
   $32\%$
4. D.
   $48\%$

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1. A.
   $25\%$
2. B.
   $50\%$
3. C.
   $75\%$
4. D.
   $37.5\%$

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1. A.
   282.6 $\text{cm}^3$
2. B.
   785 $\text{cm}^3$
3. C.
   502 $\text{cm}^3$
4. D.
   628.3 $\text{cm}^3$

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