Discussion
Grain damage rises from \( 1.2 \) to \( 3.6 \) per cent when cylinder speed is increased. The damage has risen by a factor of
Answer: D
Correct answer: 3.0
Divide the new figure by the old:
\[ \frac{3.6}{1.2} = 3.0 \]
Damage has tripled. The distractor 2.4 is the arithmetic difference in percentage points, which understates what has happened - a rise from 1.2 to 3.6 per cent is a threefold increase, and expressing it as a factor rather than as a difference is what makes the severity apparent. Broken grain is unsaleable at full price, so this is a direct loss of revenue.
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