gistfile1.cls

        $scope.getOrderMargin = function() {
            var result = 0.0;
            var costSUM = 0.00;
            var totalValue = 0.00;
            _.each($scope.sharedModel.order.OpportunityLineItems.all(), function(it) {
                if (it.hasProduct() && (!it.hasSpecialPrice() && !it.hasResidualPrice())) {
                    totalValue = totalValue + it.getTotalValue();
                    costSUM = costSUM + ((it.product2.getFreightPickUpCost() + it.product2.getListCost2()) * it.Quantity)
                }
            });
            //avoid division by zero
            if (totalValue > 0) {
                result = 100 * (1 - (costSUM / totalValue));
            }
            return result;
        };