Solving the TVM equation for the interest rate

04152018, 04:37 PM
Post: #4




RE: Solving the TVM equation for the interest rate
I looked into the very same subject when I wrote the HP41 MCODE version of TVM$.
I don't recall exactly how or why I came to this, but the expression I used for the initial guess was: i0 = [ abs( PV + n*PMT + FV) ]^1/n Surely this isn't the best, or may be not even sensible  but it works just fine for all tests and still holding up nicely. 

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