Percentage Calculation - Rounding off to Single Decimal Point

percentage.js

// Require Underscore.js

Percentage = function(numbers) {	
	var percentage = [],
		sum = _.reduce(numbers, function(m, number){ return m + number; }, 0);
		
	for(var n = 0; n < numbers.length; n++){
		percentage[n] = parseFloat((numbers[n]/sum * 100).toFixed(3));
		percentage[n] = Math.round(percentage[n] * 10)/10;
	};
	
	return percentage;
};