              INTERNAL RATE OF RETURN
              or RETURN ON INVESTMENT


   This routine determines the Internal Rate of Return On
Investment from the differential cash flow section.   There
can occur minor differences in totals due to rounding, but
since predicting future costs and values to the penny is
impossible, a difference due to rounding is not detrimental.
Once again judgement is based on relationships between
alternatives.   Data needed is the same as that needed for
discounted cash flows.

