This is the 4551st most frequent Korean word.
t당
The Korean word "당" can mean "political party," "target," "hall," or "you (informal)," depending on context.
Here, 당 is used as a suffix meaning 'per', referring to a unit rate.
그들은 밀 1톤당 가격을 계산했다.
They calculated the price per 1 ton of wheat.
당 here also means 'per', indicating a cost related to a single unit of pages.
이 서류는 페이지당 2달러씩 복사 비용이 듭니다.
This document costs $2 for photocopying per page.
In this case, 당 specifies 'per member', meaning individual allocation or allowance per person.