Many of the same Christmas carols have been sung at services for decades Church and community choirs have dusted off their Christmas carol books and chosen this year's classic offerings to audiences ...
Daily Journal: Indianapolis Symphonic Choir’s Festival of Carols to feature work by Greenwood choirs director
Indianapolis Symphonic Choir’s Festival of Carols to feature work by Greenwood choirs director
KY3: WATCH: High School choirs around Missouri perform Christmas carols at the Capitol
WATCH: High School choirs around Missouri perform Christmas carols at the Capitol
The flow rate increases 100-fold (one hundred-fold) Would be a more idiomatic way of saying this, however, the questioner asks specifically about the original phrasing. The above Ngram search would suggest that a one hundred has always been less frequently used in written language and as such should probably be avoided. Your other suggestion of by one hundred times is definitely better than a ...
As you note, "percent" means "for every hundred," so there is nothing at all wrong with percent values greater than 100 when discussing proportions, e.g. profits increased by 120%. Like fractions, however, percent values are longer to express than multiples, so for values much greater than 100 you may hear them less frequently:
relating to 100 years : marking or beginning a century, with the example "the centurial years 1600 and 1700". But there is a word that is widely used to indicate the range of years or centuries covered by an article or book: history.
Because killing 99.99% of germs is very, very different from killing all of them. In any given population, there are many, many, many germs. And leaving one alive is (theoretically) sufficient for it to reproduce. So if you're not killing all (100%) of them, there's still a chance you'll get sick.