A certificate of deposit (CD) account can be an appealing option for people who want a risk-free place to put their cash while earning more interest than a savings or money-market account can offer.

Principal is the amount you borrowed, and interest is the amount you pay to the lender as a charge for borrowing. To calculate interest, multiply the principal amount by the interest rate, then ...

The art of estimations is pretty much a physicist's bread and butter. We all love a good estimation problem. You might also hear these called a "back of the envelope" calculation, or a calculation on ...