From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: * X-Spam-Status: No, score=1.4 required=5.0 tests=BAYES_50,INVALID_MSGID autolearn=no autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 10c949,7275e5785f939c3b X-Google-Attributes: gid10c949,public X-Google-Thread: 109fba,7275e5785f939c3b X-Google-Attributes: gid109fba,public X-Google-Thread: 10baee,7275e5785f939c3b X-Google-Attributes: gid10baee,public X-Google-Thread: 1014db,7275e5785f939c3b X-Google-Attributes: gid1014db,public X-Google-Thread: f6290,7275e5785f939c3b X-Google-Attributes: gidf6290,public X-Google-Thread: 103376,7275e5785f939c3b X-Google-Attributes: gid103376,public From: thomask@cpcug.org (Keith Thomas) Subject: Re: IRR formula - Please help me Date: 1996/02/27 Message-ID: <4gthtb$8hn@news4.digex.net>#1/1 X-Deja-AN: 141280917 references: <312EAB76.5463@pixie.co.za> followup-to: comp.lang.ada,comp.lang.basic.misc,comp.lang.c,comp.lang.c++,comp.lang.clipper,comp.lang.pascal.delphi.misc organization: Capital PC User Group, Inc., Rockville, Maryland, USA newsgroups: comp.lang.ada,comp.lang.basic.misc,comp.lang.c,comp.lang.c++,comp.lang.clipper,comp.lang.pascal.delphi.misc Date: 1996-02-27T00:00:00+00:00 List-Id: 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