Help with SSRS code to get AVG from Total.

Hello,

I have field that totals up a column on a report. The expression in this field is:

[Sum(TOTAL_COST_PER_UNIT_AREA)]

This field with the expresion is named TOTAL_COST_PER_UNIT_AREA1. I like to get an average of the subtotals in this field. So, I have this custom code (see code) that is in this field, and I call the custom code via the following:

=Code.CalculateAverage(AVG(Fields!TOTAL_COST_PER_UNIT_AREA.Value), InScope("TOTAL_COST_PER_UNIT_AREA"))

The problem is TOTAL_COST_PER_UNIT_AREA is not the field I want to average. I want to average what is in TOTAL_COST_PER_UNIT_AREA1, the subtotals. However, TOTAL_COST_PER_UNIT_AREA1 is not recongized as a field. What can I change to get the average of the subtotal?

Private m_total As Double
Private m_count As Integer

Public Function CalculateAverage(average As Double, inTotalCostAcre as Boolean) As Double

If Not inTotalCostAcre Then
   ' Average of TotalCostAcre
    Return average

  Else If inTotalCostAcre Then

   ' Subtotal of inTotalCostAcre
   m_total = m_total + subtotal
   m_count = m_count + 1
   Return subtotal

Else 
        ' Average of Subtotal
       Dim avg as Double
       avg = m_total / m_count

       m_count = 0
       m_total = 0
        Return avg
End If
End Function

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