[Solved]-Rounding results in highcharts jquery script-Highcharts

try

percentageDecimals: 0 

in your tooltip

tooltip: {
    formatter: function() {
        return '<b>'+ this.point.name +'</b>: '+ Math.round(this.percentage*100)/100 +' %';
    }
},

Instead of use formatter you can set yDecimals as 2:

tooltip: {
    yDecimals: 2
}

yDecimals: Number
How many decimals to show in each series' y value. This is overridable in each series' tooltip options object. The default is to preserve all decimals.

There's a numberFormatfunction available in the Highcharts API that you can use (see http://www.highcharts.com/ref/#highcharts-object).

Quoted from API doc:

numberFormat (Number number, [Number decimals], [String decimalPoint], [String thousandsSep]) : String

Formats a JavaScript number with grouped thousands, a fixed amount of decimals and an optional decimal point. It is a port of PHP's function with the same name. See PHP number_format for a full explanation of the parameters.

tooltip: {
    formatter: function() {
        return ''+ this.series.name +''+
            this.x +': '+ Highcharts.numberFormat(this.y, 0, ',') +' millions';
    }
}, ...

Parameters

• number: Number The raw number to format.
• decimals: Number The desired number of decimals.
• decimalPoint: String The decimal point. Defaults to "." or to the string specified globally in options.lang.decimalPoint.
• thousandsSep: String The thousands separator. Defaults to "," or to the string specified globally in options.lang.thousandsSep.

Returns

A string with with the input number formatted.

tooltip: {
  valueDecimals: 2
},