Hyphens and suspensions

No recasts, please.

I say 100% correct to all examples below, yes?


1. a 10 percent–off coupon

Percents are an open compound. Use an n-dash, not a hyphen, between "percent" and "off".


2. a 22-percent-a-year increase

(Three hyphens are required in this compound modifier.)


3. a $25-million-a-year salary

(Three hyphens are required in this compound modifier.)


4. a $10-million- to $20-million-a-year national increase

{Two hyphens are needed in "$10-million-" to correctly employ the use of suspended hyphenation in this example, correct?}


5. But: a $2 million contract

{Not: a $2-million contract. Hyphen unneeded here.}


6. a $25,000- to $30,000-a-year sinecure

(Hyphen after "$25,000" as part of the suspensive hyphenation.$


7. a ten- to twenty-cent-a-day increase

(Same logic.)


8. a ten- to twenty-cent increase

(Same logic.)


Thank you.