Interest is the amount of money you must pay to borrow money in addition to the loan's principal. It's also the amount you are paid over time when you deposit money in a savings account or certificate ...

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 ...

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 ...