For your reading pleasure today, I have three basic rules for parentheses and punctuation. This information is from the Grammarbook.com website. (I have reformatted some of the text to make it easier to read.)
Parentheses
Rule 1: Use parentheses to enclose words or figures that clarify or are used as an aside.
Examples:
· I expect five hundred dollars ($500).
· He finally answered (after taking five minutes to think) that he did not understand the question.
Note: Commas could have been used in the above example. Parentheses show less emphasis or importance.
Rule 2: Use full parentheses to enclose numbers or letters used for listed items.
Example:
We need an emergency room physician who can (1) think quickly, (2) treat patients respectfully, and (3) handle complaints from the public.
Rule 3: Periods go inside parentheses only if an entire sentence is inside the parentheses.
Examples:
· Please read the analysis (I enclosed it as Attachment A.). [KC – This is a particularly ugly way to do it. I’d opt for the second or third example instead.]
· Please read the analysis. (I enclosed it as Attachment A.)
· Please read the analysis (Attachment A).

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