Adam Hayes, Ph.D., CFA, is a financial writer with 15+ years Wall Street experience as a derivatives trader. Besides his extensive derivative trading expertise, Adam is an expert in economics and ...

Simple interest is used when a company borrows money for a loan. Usually this amount will be on a monthly basis. The formula for simple interest is principal times the interest rate times the period.

Whether you are paying interest or being paid interest, it's important to fully understand how that interest is calculated. There are two basic types of interest: simple and compound. How each type is ...

The Rule of 72 has likely made its way to many table conversations about money. It’s a simple, almost magical calculation that tells you how long it takes to double your investment. And you don’t need ...