The Rule of 72 is an easy way to calculate how long it will take your investment to double in value. Here's how it works.

Sean Ross is a strategic adviser at 1031x.com, Investopedia contributor, and the founder and manager of Free Lances Ltd. Anthony Battle is a CERTIFIED FINANCIAL PLANNER™ professional. He earned the ...

To calculate the Consumer Price Index between two years in Excel, take a sum of all the amounts spent on the basket of products over those two years. Then use the following formula to find the CPI ...