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- Path: cpcug.org!not-for-mail
- From: thomask@cpcug.org (Keith Thomas)
- Newsgroups: comp.lang.ada,comp.lang.basic.misc,comp.lang.c,comp.lang.c++,comp.lang.clipper,comp.lang.pascal.delphi.misc
- Subject: Re: IRR formula - Please help me
- Followup-To: comp.lang.ada,comp.lang.basic.misc,comp.lang.c,comp.lang.c++,comp.lang.clipper,comp.lang.pascal.delphi.misc
- Date: 27 Feb 1996 00:06:03 GMT
- Organization: Capital PC User Group, Inc., Rockville, Maryland, USA
- Message-ID: <4gthtb$8hn@news4.digex.net>
- References: <312EAB76.5463@pixie.co.za>
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-
- Maurizio Incani (maurizio.incani@pixie.co.za) wrote:
- : I need to implemet the IRR formula (and calculation) into
- : a system under development.
- : I don't have a clue on what is (or looks like) the IRR.
-
- Any half-reasonable economics text book should have a description of this.
- Provided your costs and benefits do not have large variations, you will
- normally get only one answer - although if there are large variations you
- may get more than one answer. This is stretching my memory a bit as it is
- a few years since I have dealt with IRR, but I seem to remember that under
- particular conditions there may not be a real (non-imaginary) answer. It
- is often calculated by iterative methods.
-
- The definition from my old 'Engineering Economy' text book is:
-
- "the interest rate at which the present worth of the cash inflow equals
- the present worth of the cash outflow (the customary use of present
- worth amounts to determine the IRR could just as well be annual worths or
- future worths)"
-
- KT
-