Discussion
If LC3 allows clinker content to fall from 95 per cent to 50 per cent, by what proportion is the clinker per tonne reduced?
Answer: B
Correct answer: by about 47 per cent
\[ \frac{95 - 50}{95} = 0.474. \] The reduction is taken as a proportion of what was there before, not as the difference in percentage points - 45 points is not 45 per cent. Since nearly all the emission is in the clinker, the saving in carbon dioxide is close to the same figure.
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