I took an overdue book back to the library on Monday

[MIButterfly]

It was due March 29 and I brought it back on April 6. My account said it was two weeks overdue. March 29 to April 6 is eight days, not two weeks. Since the library was closed for three days for Easter, technically it was only five days overdue. I brought that to the attention of the librarian and she looked up my account but couldn't figure out why it said two weeks so she went and got her supervisor who couldn't figure it out either and told me she was "going to look into it."

Whatever.

[Historic NY]

1. Its arithmetic

there must be a section in the library that has books.

[Norrrm]

2. How much was the massive overdue penalty they could not let go?

[forgotmylogin]

3. If they accumulate fees by weeks, 8 days spans two weeks.

I don't know what libraries charge these days, but it's probably easier to figure out $1 per week than 15 cents per day.