Library Overdue

Yesterday, I borrowed a book from closed area to do the Chinese presentation.
However, i forget to return it back on time..

Yesterday 18:30 - today 18:00 ..overdue 24 hours.....>_<;;;

First 12 hours $2 penlity and followed by $4
12*2 + 12*4 = $72......

破世界紀錄...
b4 i had $14 penlity..

So, today i paid 世界紀錄 $86 penlity to cityu lib

I should be more carefully next time