To calculate interest on a CD ... much interest you'll earn with the best CD rates, you can use a CD calculator to do the math for you. We'll explain how to use a CD rate calculator.

Here's the math: $100 million net income-$20 million change in retained earnings = $80 million paid in dividends. Image source: Getty Images. One of the most useful reasons to calculate a company ...

Or you could add 50% and 25% It is useful to know that A% of B is the same as B% of A. This is helpful to remember when calculating a trickier percentage.