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The word has been seen in the manga ハヤテのごとく！

After finishing last, Hayate is given a card with no money on it but
“unlimited debt”:

[![panel from ハヤテのごとく！ vol. 46 p.
28](https://i.stack.imgur.com/Ey3Dh.jpg)](https://i.stack.imgur.com/Ey3Dh.jpg)

The full sentence reads

> そちらは入金が一切ない代わりに十五{とご}で無制限に借金が出来る『うしじまカード』となっております。

What could 十五 mean here? If it does mean “fifteen”(percent?), why is it not
read じゅうご?
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2022-07-30T21:06:28.577
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2022-07-30T21:28:38.927
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question
translation words readings
Meaning of 十五【とご】
As @Jimmy Yang's linked page suggests, トゴ is slang used in the context of
usury, meaning 十日{とおか}で五割{ごわり}. Taking the first kana of each word we get トゴ.
It is an illegal practice to loan money at an abusive interest rate: 50% every
10 days. In Japan it is known as 闇金{やみきん} (black market loans). Such high
interest is called 高金利{こうきんり}.

>
> トゴは10日経過するごとに5割の利息がつく方式で、3つの中では最も高い金利です。トゴで10万円を借りると10日で5万円、20日で10万円、30日で15万円の利息です。([source](https://saimusos.net/yamikin/53#toc5))
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answer