Add Yahoo as a preferred source to see more of our stories on Google. Knowing your loan's interest rate matters, as does learning how that rate is calculated. Interest is either simple or compound. If ...

Julia Kagan is a financial/consumer journalist and former senior editor, personal finance, of Investopedia. Doretha Clemons, Ph.D., MBA, PMP, has been a corporate IT executive and professor for 34 ...

Simple interest calculates earnings or payments based solely on the initial principal, while compound interest grows by calculating interest on both the principal and the accumulated interest over ...

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 the interest applied only to the original amount of money deposited or borrowed. Calculating simple interest requires knowing your principal amount, annual interest rate, and time ...