On the surface, an interest rate is just a number. How that number applies to debt or equity opens up a world of possibilities. The first consideration is always whether it’s simple interest vs.

Source: Flickr user Dafne Cholet. Simple interest refers to interest that's calculated solely based on the principal, and not any interest that has already accrued. The general formula for computing ...

There are two main types of interest that you’ll have to pay when you borrow money to pay for something: compound interest or simple interest. Simple interest, as it sounds, is the simplest and the ...