Discussion
A works replaces 5 per cent of its 3,000 tonnes of daily raw meal with an alternative material. How much quarried stone does it save in a 300-day year?
Answer: C
Five per cent of 3,000 tonnes is 150 tonnes a day, and over 300 days that is 45,000 tonnes. A seemingly small substitution rate translates into a very substantial saving across a year. Substitution rates are quoted per tonne but judged on the annual total.
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