If the price of a share falls from $50 to $40, by what percentage must it now rise to return to $50?
The rise is measured from the new base of $40: 10 ÷ 40 = 25%. A 20% fall always needs a 25% rise to recover — percentage changes are not symmetrical.
Q6Verbal
Which is the best correction? "Having reviewed the applications, the deadline was extended by the committee."
This is a dangling modifier: as written, the deadline reviewed the applications. The opening phrase must attach to whoever did the reviewing — the committee.