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The six-tenths rule scales cost with capacity by raising the capacity ratio to a power of about

  • A.0.6
  • B.1.0
  • C.1.6
  • D.0.06

Answer: A

Doubling the capacity of a plant multiplies its cost by two to the power 0.6, that is about 1.52, rather than by two. The economy arises because vessel and pipe cost grows roughly with surface area while capacity grows with volume.

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