5 one hundreds because 50 tens is 500 (50 x 10 =500) so 5 one hundreds is 500
so it is 5 one hundreds
You cannot put any sort of endmark (period, question mark, or exclamation point) here because it is not a complete sentence. Complete sentences must have a subject and a predicate. You can tell there's not even a verb here, so this is just a fragment, and we would have to use a comma.
a. Very truly yours,
Because of the interrogations
