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HP Forum Archive 21

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30B TVM slightly different results
Message #1 Posted by Bill Platt on 25 Mar 2012, 4:47 p.m.

Has anyone noticed that the 30B is about a penny or two different in payment results for a typical 100k loan?

12C, 10B, 27S/17Bii, 48G all give identical results, different from 30B.

      
Re: 30B TVM slightly different results
Message #2 Posted by David Griffith on 25 Mar 2012, 6:55 p.m.,
in response to message #1 by Bill Platt

There are several complaints about that bug on HP's own calculator forum at http://h30499.www3.hp.com/t5/Calculators/bd-p/bsc-408

      
Re: 30B TVM slightly different results
Message #3 Posted by cyrille de brebisson on 26 Mar 2012, 1:52 a.m.,
in response to message #1 by Bill Platt

Hello

Quote:
Has anyone noticed that the 30B is about a penny or two different in payment results for a typical 100k loan?

Can you give one or 2 examples please?

cyrille

            
Re: 30B TVM slightly different results
Message #4 Posted by bill platt on 26 Mar 2012, 10:18 a.m.,
in response to message #3 by cyrille de brebisson

Hi Cyrille,

Sure, here a couple. Thanks for asking :-)


END mode.

N = 360.
I/yr = 5.0%
PV = 100,000.

30b        -536.836041607         
48G        -536.821623012    
12C(1985)  -536.8216230

I/yr = 10.0%
PV = 50,000.

30b        -438.791093633
48G        -438.785785044
12C(1985)  -438.7857850

Switch to BEGIN mode:
I/yr = 10.0%
PV = 50,000.

30b        -435.164720958
48G        -435.159456242
12C(1985)  -435.1594562

Edited: 26 Mar 2012, 10:39 a.m.

                  
Re: 30B TVM slightly different results
Message #5 Posted by peacecalc on 26 Mar 2012, 10:51 a.m.,
in response to message #4 by bill platt

Hello bill,

I can't confirm your results. My HP 30b shows same results like my HP 50g and they are the same like your HP 48G and HP 12c shows.

Maybe there is a slight amount in the FV store place after an calculation, so try to input a zero in FV before you perform the comparing calculations.

Sincerely peacecalc

                        
Re: 30B TVM slightly different results
Message #6 Posted by bill platt on 26 Mar 2012, 11:21 a.m.,
in response to message #5 by peacecalc

THANKS!

Now I feel compltely STUPID!

There was "12" in the FV register.

D'oh!

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