Roman Numerals Puzzle

Reader, whether man or woman
Write my age in figures Roman
Three lettered units then you'll find
Each of the different in kind;
The first divided by the second
Will give the third, if rightly reckoned
Ten times the whole will let you see
My University degree

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Word Puzzle

Which well-known words or phrases are represented by the codes below?
1/ SIOUTDE
2/ BUR
3/ DISUMMERAN
4/ CCCCCCC
5/ $$$PINNER

Logic Puzzle

Three men named Lewis, Miller, and Nelson work as accountant, cashier and clerk in the same department store.

If Nelson is the cashier, Miller is the clerk.
If Nelson is the clerk, Miller is the accountant.
If miller is not the cashier, Lewis is the clerk.
If Lewis is the accountant, Nelson is the clerk.

What is each man's job?