<script>
    $(function () {
        var tfoot = '<tfoot><tr><td>Total</td><td colspan="2">&nbsp;</td>';
        tfoot += '<td>@Sum.ToString("c")</td></tr></tfoot>';
        $('table').append(tfoot);
    })

</script>

@model EnzoApplication.Models.IngListModel
<script>
    $(function () {
        var tfoot = '<tfoot><tr><td>Total</td><td colspan="2">&nbsp;</td>';
        tfoot += '<td>@Model.sum("c")</td></tr></tfoot>';
        $('table').append(tfoot);
    })
</script>

var sum = db.IngLists.Where(x => x.ArticleId == id).Sum(x => (float?)x.amount);

@grid.Table(
            columns: grid.Columns(
            grid.Column ...
            ...
            ...
            ),
            footer: @<text>Итог:  @ViewBag.sum.ToString("0.00") кг, Фактические потери: @ViewBag.los.ToString("0.00") кг, Отчетные потери: @ViewBag.replos.ToString("0.00") кг</text>)