how aggregate formula calculates data on table

how aggregate formula calculates data on table

I would like to know how aggregate formula calculates data on table in Zoho Analytics.
Specifically, when you want to calculate ratio(%), I was wondering how aggregate formula calculates it.

I made the aggregate formula below on the deals table.
count_if("Deals"."Stage" = 'Closed Won')/count("Deals"."Id")*100

But I think that the calculation result could be error depending on how aggregate formula calculates data on table.
I guess the aggregaet formula is supposed to caluculate the ratio in either way below.

<Caluculate way>
No.1: The aggregate formula calculates the sum total of each records data and then calculates ratio of the sum total of all records.
No.2: The aggregate formula calculates ratio of each records data and then caluculates the sum total of the each ratio.

If the aggregate formula use No.1 for caluculation, the result of caluculation should be fine, 
otherwise, if No.2 is used for caluculation, the result must be error.

So Basically, I would like to know which way the aggregate formula use for caluculating ratio.
Or, if the aggregate formula use the other way, let me know.

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