The Rule of 72 is a shortcut or rule of thumb used to estimate the number of years required to double your money at a given annual rate of return and vice versa.

Businesses rarely loan or borrow money without receiving or paying interest on the loan amount. Although loans may use simple interest, most loans compound the interest periodically or continuously on ...

Once a principal balance earns interest, that interest becomes a part of the principal and continues to earn more interest—that is the magic of compounding. What Is Compound Interest? How Does It Work ...