To calculate the simple interest you’ll earn in a savings account, multiply the account balance by the interest rate by the time period the money is in the account.

To calculate it, convert the sales tax percentage to a decimal, then multiply it by the retail price of the product or service. For example, in a state with a sales tax percentage of 5%, the sales ...

The mode is a statistical term for the value that occurs most frequently in a set of numbers. Learn about the difference between the mean, median, and mode.

While the rule of 72 is a useful rule of thumb to estimate investment returns, using an online calculator or a compound growth formula may yield more accurate results.