Personally, I'd just use a multiple choice with text entry that reads 'Percent of time spent on digital dragons discussions' and then the other choice 'Don't know'.

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Hello @Cathaya ,

Agreed with @jpardicusick, but for look and feel you can do the following:

You can use custom JS to hide the first option label and add '%' after the text box.

Try adding below code in the js(OnReady) of the single answer question:

var that = this.questionId;
jQuery("#"+that+" .SingleAnswer:eq(0)").hide();
jQuery("<span>%</span>").insertAfter(jQuery("#"+this.questionId+" .InputText"));

jQuery("#"+that+" input[type='radio']:eq(1)").on('click',function(){
jQuery("#"+that+" .InputText").val('');
});

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