How do you punctuate single words in quotation marks... does the placement of the quotation mark depend upon the punctuation used?

I was just writing something that brought up a problem I have with punctuation. I shall use the sentence I just wrote as an example.

I believe that the following sentence is correct: ””‘Corrupt’ and ‘unscrupulous’ fit this company’s business practices to a ‘T.’” For Jellies with aging eyes, like me, the period is inside of the quotation marks.

What would be the order of the punctuation if it is a question. For instance:

“Does this business’s business practices fit the words ‘unscrupulous’ and ‘corrupt’ to a ‘T?’” Or would it be “Does this business’s business practices fit the words ‘unscrupulous’ and ‘corrupt’ to a ‘T’?” Again, for those of us with vision problems, I put the question mark inside the quotation marks in the first sentence. In the second sentence, the question mark is outside of the quotation marks.

Basically, does the change of a period to a question mark, an exclamation point, or other punctuation mark, change the order of period/question mark/etc. and quotation mark?

Another question: did I write “this business’s practices” properly?