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 ...
Yes, the correct usage is that 100% increase is the same as a two-fold increase. The reason is that when using percentages we are referring to the difference between the final amount and the initial amount as a fraction (or percent) of the original amount.
Why is "a 100% increase" the same amount as "a two-fold increase"?
If soap A kills 100% and soap B kills 99.99% of bacteria, the remaining amount of bacteria after applying A (0%) is infinitely smaller than the remaining amount of bacteria after applying B (0.01%). Therefore A is much, much better. You can see from these examples that 0.01% gap behaves differently across the percentage scale.
People often say that percentages greater than 100 make no sense because you can't have more than all of something. This is simply silly and mathematically ignorant. A percentage is just a ratio between two numbers. There are many situations where it is perfectly reasonable for the numerator of a fraction to be greater than the denominator.
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.
2 Use 100% when you are stating mathematical thought like statistics. Use "one hundred percent" when you are stating non-mathematical thought like a story.
word choice - Choosing between "100%" and "cent percent" - English ...
‘100% correct’ is grammatically correct in this context, though the organization of the sentence is a bit atypical for many more formal dialects of English and may be difficult for some people to understand without having to think a bit (I would instead restructure things as suggested at the end of Astralbee’s answer as that resolves both ...
And the usage always seems to involve a number between 100 and 200: "a buck fifty" and so forth (the term seems to be wedded to the indefinite article: "a buck something ").
When did "a buck" start being used to mean any unit of 100? (E.g. "a ...
The type of writing you are doing also plays into your decision. For example, in legally binding documents, like contracts or exhibits to contracts, the spelled out number is the legally binding number. So if a text said that, "you are 99% (one-hundred percent) responsible", the 100% number would be legally binding, not 99%.
Is It Ok To Write "100%" In A Formal Text? - English Language & Usage ...
You miss 100 percent of the shots you don't take. 1991 Burton W. Kanter, "AARP—Asset Accumulation, Retention and Protection," Taxes 69: 717: "Wayne Gretzky, relating the comment of one of his early coaches who, frustrated by his lack of scoring in an important game told him, 'You miss 100% of the shots you never take.'" ...
What was the first use of the saying, "You miss 100% of the shots you ...