How can I get highcharts Donut chart to auto calculate percentages -


how donut chart in highcharts auto calculate precentages of data sent . example data can data: [50.85, 7.35, 33.06, 2.81] , want know how can charts calculate inner pie chart (of donut chart) show or render percentages?

use: 

this.percentage

example jsfiddle: 

datalabels: {      formatter: function() {      return '<b>'+ this.point.name +':</b> '+ this.percentage +'%';      } }

api:

http://api.highcharts.com/highcharts#plotoptions.series.datalabels.formatter

http://api.highcharts.com/highcharts#tooltip.formatter


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