score:0

Accepted answer

Okay I just solve my own question for the first time. Here is how it done.

 bars.getTooltipText = function (e) {
            return [
                "Point : " + e.aggField[0] + "",
                "Value : " + e.yValue + "%",
                "Series : " + e.cx + ""
            ];
        }; 

score:0

When you use addPctAxis you should pass the value and the function calculate the percentage for you. Then you can set tickFormat to change the percentage value to display decimal values:

y.tickFormat = ".2%";

fiddle


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