The percentage value of the alcohol corresponds to the purity of the alcohol used, not to the percentage of alcohol in the entire mix. You'll see some edcs saying they're 70% alcohol, for example, and it doesn't mean that the rest is oils. I'm pretty sure it means that the rest of the alcohol used is water, as a mater of fact.
My source is the Web site of the American Society of Perfumers, www.perfumers.org, which says the following about the difference between edc, edt, and other concentrations:
"Eau de Cologne, Eau de Toilette and Eau de Parfum are all alcoholic solutions of fragrance oils. They differ in the percentage of fragrance oil, and the grade of alcohol. An EDT is a 6-15% solution of fragrance oil in an 80% grade of alcohol. Eau de Cologne is a 3-6% solution of fragrance oil in a 70% grade alcohol. An Eau de Parfum usually contains 15-25% fragrance oil in pure ethyl alcohol. (The grade of alcohol denotes the % of alcohol to water.) "
The T at the end of Impact is pronounced. The IM is a nasal sound of which it's hard to find a duplicate in English, but doesn't exactly pronouce the M as English speakers do. It would be this nasal IM followed pretty accurately with "pact." Ehhhmmm-pact, maybe.
PuH is great stuff. I've got a sample of it too and will need wear them both soon.