If a term paper consisted 42 pages,each containing 40 lines of 100 symbols each (counting each space as symbol)was to be encoded using unicode, how many bytes of storage space would be required?

Answer 1

Unicode is not a single coding system, there is UTF-8 which uses 1-4 byts for each character, and UTF-16 which uses 2-4 bytes for each character.
If you want to be conservative, you can count 4 bytes per character/symbol.
See
http://en.wikipedia.org/wiki/Unicode

Answer 2

336,000 bytes