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.
Never use "double" or "float" for money calculations. Use integer arithmetic (in cents, pence etc.) or BigDecimal. If you don't know why, read up on floating-point arithmetic and why it is unsuitable for currency calculations.
Betty Rubble? Well, I would go with Betty... but I'd be thinking of Wilma.