How do you figure the Return On Investment - ROI?

There are so many variables but simply put It is Money Earned-Investment/Investment=ROI

To calculate ROI, the benefit (or return of money or income gained) of an investment is divided by the cost of the investment. ROI is usually shown as a percentage. This formula can also be used to...

It's a human nature that if he devotes/(invest) his resources he looks for an healthy outcome (Return) i.e., he wants return on what he had invested. In short it is ROI. (RETURN ON INVESTMENT) A...

Return on investment is the amount of profit on the invested money after deducting taxes, safety of investment is the risk factor involved in the investment. Such as risk is high safety of investment...

-The income from a venture that ia distributed to investors