The rule of 72 is a shortcut investors can use to determine how long it will take their investment to double based on a fixed annual rate of return. To use the rule of 72, divide 72 by the fixed rate ...

Steven Nickolas is a writer and has 10+ years of experience working as a consultant to retail and institutional investors. Dr. JeFreda R. Brown is a financial consultant, Certified Financial Education ...

Julia Kagan is a financial/consumer journalist and former senior editor, personal finance, of Investopedia. A loan constant is a percentage that shows the annual debt service on a loan compared to its ...