en dash

Hi, all.

Without rewording any of the following, which, in your opinion, are the best choices. Please put 'yes' or 'no' next to each one to indicate agreement or disagreement.

(1) It is a $160 billion–$170 billion a year industry.
(The en dash is used here as a substitute for the word to. I don't think hyphens are needed at all in this phrase because it's easily understood without them. Do you agree with the example above?) If we didn't use the en dash, I think that It is a $160 billion to $170 billion a year industry works nicely without any hyphens, agreed?)

(2) I also think that a $10 million a year business looks much better than a $10-million-a-year business— yes or no?

(3) I think the following looks wrong. Do you agree? The example above is much cleaner, uncluttered, and easily readable.
It is a $160 billion- to $170 billion-a-year industry. {I say thumbs-down to this horrific-looking example.}

(4) a $160–170 billion a year industry
Omitting the $ sign before '170' shows that the phrase means exactly what it's supposed to mean: 'a one hundred sixty (million) to one hundred seventy billion dollar a year industry.' Yes or no?

(5) a $160–$170 billion a year industry
But if we insert a $ sign before '170,' it changes the meaning to 'a one hundred sixty dollar to one hundred seventy billion dollar a year industry,' correct?

(6) a $950,000–1 million a year savings (good?)
No dollar sign before '1 million.'

Let me know your thoughts on each of the 5 examples, please.

Which is your top pick? Which is the least favored?

Thank you.