ROI is return on investment. It is a performance measures used to evaluate the effeciency of an investment. It is calculated to know whether there is good return on the investment or not. It measures the profitability of an investment. It's formula is current value of Investment - cost of Investment divided by cost of Investment ×100. We get the percentage result from this formula. In short revenue - cost divided by cost. 
Also Read :- what is the full form of ICMR.
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