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I am writing to inquire the convention of writing the following percentage range in academic writing:

We reduce the extra cost from 99.9% to 12%--24% (depending on different configuration schemes).

Or

We reduce the extra cost from 99.9% to 12--24% (depending on different configuration schemes).

Maybe I ask which one is more proper in academic writing? I tried to search in Google Scholar but it seems that both usage can be found (although the second one seems more frequent).

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    You can look this up by Googling for example percentage range in apa style or percentage range in mla style.
    – Řídící
    Commented May 24, 2020 at 7:11
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    With 2 dashes, it looks like a range from twelve to negative 24.
    – Lawrence
    Commented May 24, 2020 at 13:26
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    If your word processor allows it, you should consider using an en dash instead of hyphens to indicate a range of numbers. This eliminates the ambiguity between a second hyphen and a negative sign on the second number.
    – The Photon
    Commented May 24, 2020 at 15:01

1 Answer 1

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I confirm the following usage is recommended in apa style:

Ranges of percentages may be presented using the percent sign only once (10–20%, 20 to 30%)

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