Question about percentages in slider

Hi, I have a slider question in my survey where I want the respondent to estimate a threat with a .. % change of .... What is initially shown (without JavaScript) on the slider is just numbers from 0 to 100. To add % to the numbers, I checked out the community. I got some codes, but neither of them work in the right way.
If I use this code:
jQuery("#"+this.questionId+" .numbers li").each(function(){

jQuery(this).text((jQuery(this).text()+"%").trim().replace(" ",""));

});
I get two times the % symbol (0%%). How can I delete one? Or am I using the code in the wrong way?