Silly Question

[onealx4]

What is ROI? Im new to these forums and acronyms, can figure most out but this one has me stumped..

[Gramps]

ROI = Return On Investment.

If you play in a $55 SNG ($50 into prize pool, $5 fee), and over the course of playing 100 of them you average a $5.50 profit per $55 SNG, then your ROI would be 10% for this sample.

Etc.

[onealx4]

Any good software I can use to keep track of this?