jquery ajax call

Question

i am using piechart in asp.net  web application.
 my code
<div class="col-md-4">
<div class="circular-bar">
<div class="circular-bar-chart" data-percent="45" data-plugin-options='{ "barColor": "#ff8000", "delay": 300 }'>

<label><span class="percent">45</span>%</label>
</div>
</div>
</div>
 ho w to assign data-percent value dynamically with using jquery and Ajax calls.
i am write one web  method. in my method take arguments and return value, how to assign the return value to data-percentage.