You can put this solution on YOUR website! You know that a percentage is out of 100, right? And you know that, in this case, 29 is out of 145. So all you have to do is set up a proportion.
29/145=x/100 ---> showing that 29 is a certain percentage of 100
Now cross-multiply.
2900=145x
Divide both sides by 145 to get the variable(the letter) alone.
x=20
Your answer is 20%.