One of the efficiency metrics of Financial Investment defined as ratio of Cash Return over amount of Initial Investment:

$\begin{array}{l}\displaystyle \rm ROI = \frac{Cash \ Return − Cost \ of \ Investment}{Initial \ Investment}\end{array}$

where

$\begin{array}{l}\rm Cost \ of \ Investment\end{array}$

consist of $\begin{array}{l}\rm Initial \ Investment\end{array}$ and al types of additional expenses to facilitate Cash Return

ROI is normally presented in percentage (120%, 300%, ...).

Alternatively it can be presented as multiplier of Initial Investment:

1X	Cash Return are equal to Initial Investment
2X	Cash Return are twice higher than Initial Investment
3X	Cash Return are three times higher than Initial Investment
...	...

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See also