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A grinding aid raises mill output from 100 to 115 tonnes an hour. What is the percentage increase?

  • A.13 per cent
  • B.15 per cent
  • C.1.15 per cent
  • D.85 per cent

Answer: B

The increase of 15 tonnes on a base of 100 is 15 per cent. Gains of this order are typical and are weighed against the cost of the additive per tonne of cement produced. The dose is typically a fraction of a kilogram per tonne.

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