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For that same plant, the cost per tonne of daily capacity has fallen from 100 000 to about

  • A.75 800
  • B.100 000
  • C.151 600
  • D.50 000

Answer: A

Correct answer: 75 800

\[ \frac{15{,}157{,}000}{200} = 75{,}800\ \mathrm{per\ tonne\ of\ daily\ capacity}, \] against 100,000 for the smaller plant. The unit cost has fallen by about a quarter, and that fall is the whole practical consequence of the exponent being below one.

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