5 Smart Investing Strategies The slideshow presentation that you would like to view is too large for your current screen resolution. Click here to view to view the slideshow at full resolution. Launch Presentation » Share | Related Content The Rule of 72 Do you know how long it may take for your investments to double in value? The Rule of 72 is a quick way to figure it out. Earnings for All Seasons Earnings season can move markets. What is it and why is it important? Saving for College This calculator can help you estimate how much you should be saving for college.