Is ROI profit&#x2F;investment or revenue&#x2F;investment?<p><a href="http:&#x2F;&#x2F;www.investopedia.com&#x2F;terms&#x2F;r&#x2F;returnoninvestment.asp" rel="nofollow">http:&#x2F;&#x2F;www.investopedia.com&#x2F;terms&#x2F;r&#x2F;returnoninvestment.asp</a> says its the first one.