This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
There is a loss of precision due to the fact that it can't represent the answer as a power of two. (rather than round, it tells you 2.0999999...). It's representative of the inaccuracy of computers when it comes to floating point numbers.