One simple math formula forms the fundamental basis for the human economy. Just remember that in many ways, compound interest is one of the main reasons we're here.

Fannie Mae has an excellent landlord guide that lists the lifespan of various components for easy reference. Here's the formula, using the example of a mid-priced electric range at Home Depot ...

Q. I have prepared projections for a proposed project, and I want to calculate the internal rate of return. Instead of using Excel’s IRR function, should I use simple math formulas so others can ...