Question: Without hard evidence, the author believes that a presort discount of e of a cent might induce as many as 20 billion presorted pieces.
The author was correct in his assumption.

Answer: it is not possible to tell

Question: About six o'clock, sir.
Around 6 pm, sir.

Answer: it is not possible to tell

Question: Construction man-hours are approximately proportional to the tons of steel fabricated.
Construction man-hours are completely disproportionate to the tons of steel fabricated.

Answer:
no