DataTable.Compute Issue

BUT....

it writes to every row the calculated value.  I need it to be in the last row for that container number.  Please Help

The output looks like this now:

 

 

     public System.Data.DataTable Calc(System.Data.DataTable ACTable)
        {
            string i_sGroupByColumn = "CONTAINER";

            //adding column for the row count 
            ACTable.Columns.Add("Results", typeof(decimal));

            //looping thru distinct values for the group, counting 
            foreach (DataRow dr in ACTable.Rows)
            {
                for (int i = 0; i < ACTable.Rows.Count; i++)
                {
                    System.Data.DataTable dtContainer = new System.Data.DataTable();
                    dtContainer = GetData.GetContainerSize(ACTable.Rows[i]["Type"].ToString());
                    decimal dContainerSize = Convert.ToDecimal(dtContainer.Rows[0]["Container_Size"].ToString());

                    string cExpr = "SUM(CONVERT(ColumnV, 'System.Decimal'))";
                    string cCond = i_sGroupByColumn + " = '" + dr[i_sGroupByColumn] + "'";

                    object dSumVal;
                    dSumVal = ACTable.Compute(cExpr, cCond);
                    dr["Results"] = Convert.ToDecimal(dSumVal) / dContainerSize;
                }  
            } 
            return ACTable;
        }
      }