Publisher: Adkins, Matchet and Toy, 1998, 179 pages
This often overlooked book is an excellent introduction to the investment and finance worlds as well as a very practical book on handling the MBA type calculations you often find yourself needing (just kidding).
Buy a HP calculator (obviously) and this book, if you envision a career in the investment world. Recommended reading, even if you don't.
Also part of Financial Business Box.