Below are the results of three Investment Calculator settings.

1) Normal Settings: 
1:1 (this is the base value to compare).
 

2)  Tax Rate set to Zero:
1:2 (means funds roughly doubled without taxes).
 

3) Rate of Return Increased to 25%. (which is 1/2 or 1/4 of yields)
1:34 (means funds multiplied about 34 times with a higher rate and no tax).
 

Try it yourself here:

http://www.calculatorweb.com/calculators/graphinvestcalc.shtml