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State whether the following is true or false.
A reduction from 95 to 50 per cent clinker is a 45 per cent reduction in clinker use.

  • A.False only at small scales
  • B.True
  • C.False
  • D.True only at large scales

Answer: C

It is a fall of 45 percentage points, but as a proportion of the original figure the reduction is about 47 per cent. The two are commonly confused and give noticeably different answers when the starting figure is not a hundred.

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