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60% of their shops are located in small market areas where their population is 20000 or below.

Is this correct and natural?
Thanks.
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Whose population?
Thanks, Mr M.

Liveinjapan60% of their shops are located in small market areas where their population is 20000 or below.
I mean small market area as a city or town and they might have the population of about 20,000.
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No numerals at the beginning or end of a sentence:

Sixty percent of their shops are located in small market areas where the population is below 20,000.
Mister MicawberNo numerals at the beginning or end of a sentence:Sixty percent of their shops are located in small market areas where the population is below 20,000.
Thanks so much!
I understand but one thing:
Why 20,000 is not a numeral?
Thanks.
Ah. It is. I didn't present all the parameters.

1-- No numerals at the beginning or end of a sentence if there is any hint of confusion (e.g. where a period might be confused with a decimal point), and generally good style not to do so ever.

But

2-- Don't use words for very big numbers, which looks long and awkward.

As you can see, my subconscious use of these two guidelines opted for words at the beginning and numerals at the end.
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You are a great teacher, Mr M. Thanks!
Mister Micawber1-- No numerals at the beginning or end of a sentence if there is any hint of confusion (e.g. where a period might be confused with a decimal point), and generally good style not to do so ever.
In this sentence, "it is" is omitted from the second part?
Mister Micawber2-- Don't use words for very big numbers, which looks long and awkward.
Is it supposed to be "which look ..." instead of "which looks ..."? Both "words" and "numbers" are in plural forms(form?).

Thank you,

D