Discussion
Extraction efficiency is defined as oil recovered divided by oil present. With \( 420 \) kg present and \( 375 \) kg recovered it is
Answer: C
Correct answer: 89.3 per cent
Efficiency is recovered over present:
\[ \eta = \frac{375}{420} \times 100 = 89.3\% \]
The distractor 78.6 per cent comes from dividing by twice the difference, and 10.7 per cent is the fraction lost - the complement, and a useful check, since \( 89.3 + 10.7 = 100 \). A figure above 100 per cent is impossible by definition, so the fourth option can be eliminated without any arithmetic. Efficiency around 89 per cent is typical of pressing, well below the 99 per cent a solvent plant achieves.
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