ROI stands for Return on Investment. It is common used as a metric in finance industry to measure the amount of return of an investment relative to the total investment you have placed. Typically ROI is expressed as percentage and calculated by dividing the net gain of investment by its cost and multiplied by 100. 

ROI = (Net Gain / Cost of Investment) * 100

However, it is important to remember that when evaluating a business or investment performance, you should also consider other factors such as risk into account.
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