Show percentage in footer from each three columns in gridview

Hello again.I have three columns.In these columns the values are like: 3/4 ,5/6 etc.I want to show in the equivalent footer cell the sum and divide of this columns. Example if a column has 2 rows with values 1/2 , 2/4 I want to show 1+2/2+4=0.5=50% in the footer cell .Any suggestions?

this is the asp code from the GridViewHomeTeamStats that are included :

<asp:GridView ID="GridViewHomeTeamStats" runat="server" AutoGenerateColumns="False" DataSourceID="SqlDataSourceHomeTeam" ShowFooter="True" OnRowDataBound="GridViewHomeTeamStats_RowDataBound">
    <Columns>            
        <asp:TemplateField HeaderText="FT" SortExpression="FREE_THROW_MADE">
            <ItemTemplate>
                <asp:Label ID="Label1" runat="server" Text='<%# Eval("FREE_THROW_MADE") + "/" + Eval("FREE_THROW_ATTEMPT") %>'></asp:Label></ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="2P" SortExpression="2POINTS_MADE">
            <ItemTemplate>
                <asp:Label ID="Label2" runat="server" Text='<%# Eval("2POINTS_MADE") + "/" + Eval("2POINTS_ATTEMPT") %>'></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="3P" SortExpression="3POINT_MADE">
            <ItemTemplate>
                <asp:Label ID="Label3" runat="server" Text='<%# Eval("3POINT_MADE") + "/" + Eval("3POINT_ATTEMPT") %>'></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>

Tags: C#, ASP.NET, SQL Server, Gridview