Закон о затезној камати
https://nbs.rs/export/sites/NBS_site/documents/propisi/zakon...

Члан 6.

Затезна камата, у смислу овог закона, обрачунава се за календарски број дана периодa доцње у измиривању обавеза у односу на календарски број дана у години (365, односно 366 дана), применом простог интересног рачуна од сто и декурзивног начина обрачуна, без приписа обрачунате затезне камате главници истеком обрачунског периода, према следећој формули:

k = G × p × d ,
100 × Gd

где је:

k – износ затезне камате,

G – износ дуга,

p – прописана годишња стопа затезне камате,

d – календарски број дана доцње у обрачунском периоду,

Gd – календарски број дана у години (365 – проста година, односно 366 дана – преступна година).


As stated in the official translation of the Law on default interest rate by NBS:
https://nbs.rs/export/sites/NBS_site/documents-eng/propisi/z...


Article 6
Within the meaning of this Law, the default interest shall be calculated for the number of calendar
days in default relative to the number of calendar days in a year (365 or 366), by applying the simple
interest formula and the decursive method and without accruing the default interest to the principal after
the expiry of the accounting period. The following formula is applied:

k = G × p × d ,
100 × Gd

where:

k – default interest,

G – debt amount,

p – prescribed default rate per annum,

d – number of calendar days of default during the accounting period,

Gd – number of calendar days in a year (365 days – common year, 366 days – leap year).

Serbian term (edited): применом простог интересног рачуна од сто

as "сто" / 100 represents the base amount on which the interest rate is applied, this is more explicit.

a shorter version, leaving out "obvious parts", would be:

by applying a simple interest rate (calculation)

Personally, I would stick to the ST.

IOW, there will not be any compound interest charged, only "simple interest".

see "simple interest vs compound interest" for explanations.

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Note added at 4 days (2021-06-05 04:11:34 GMT)
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the same meaning, expressed in a different way:

без приписа обрачунате затезне камате главници истеком обрачунског периода

IOW the whole calculation by applying a "simple interest rate" is to be done on the "principal amount" i.e. the main obligation i.e. here "the due amount".

Might sound "obvious" as none of the OTHER "percentage calculations" would make sense here, but if the ST says it explicitly it should be reproduced in the translation.



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Note added at 382 days (2022-06-18 03:31:46 GMT)
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"100" is for sure not any specific "due amount" - that's not how maths works.

It's a symbolic reference to whatever number (or amount of money) is used as "the principal amount" on which interest rate is applied (here it refers the amount of the penalty) - the point being in this ST that "the base amount" stays always the same - there is NO "compound interest" to change that base amount for calculating interest in the next period.

regarding http://www.tfzr.uns.ac.rs/Content/files/0/FINANSIJSKA MATEMA...

"od sto" is mentioned in the chapter "1.PROST INTERESNI RAČUN"

Interesni račun od sto koristimo u slučaju kada je poznat iznos kapitala K. etc

It say exactly the same thing I keep saying: "100" is the initial amount ON WHICH is added interest by using "a simple interest rate calculation" / "PROST INTERESNI RAČUN"

the calculation method is the same, whether the "100" (the initial amount) is some invested capital yielding interests or a fine "yielding" more and more "late payment penalties" with the passing of time.