TVM and example in User Guide

05162015, 08:56 PM
(This post was last modified: 05162015 08:58 PM by salvomic.)
Post: #1




TVM and example in User Guide
hi,
with the example of page 292 in User Guide, I'm calculating the Amortization, but I get something different from that example (next page). i.e. I get (now with FW 7820): P Principal Interest Balance 1 1676.57 9700.63 148323.43 2 1788.85 9588.35 146534.58 ... The example has: P Principal Interest Balance 1 1676.57 9700.63 148323.43 2 3465.42 19288.98 146534.58 Is it a different mod of calc for amortization? or the values for TVM were different from those printed? I would like to know more about the guidelines in Finance App... Thank you, Salvo ∫aL√0mic (IT9CLU), HP Prime 50g 41CX 71b 42s 12C 15C  DM42 WP34s :: Prime Soft. Lib 

05162015, 10:43 PM
Post: #2




RE: TVM and example in User Guide
Salvo,
You are correct sir, I did the same exercise as you and it looks like a group's principal and interest amounts are now only for a given group. Whereas in the previous firmware (verified with my Android emulator), they were accumulative amounts. An argument can be made to display it either way, but, I think it would be best to have the option to display it both ways with maybe a checkbox to select the desired format... 

05172015, 08:15 AM
(This post was last modified: 05172015 09:17 AM by salvomic.)
Post: #3




RE: TVM and example in User Guide
(05162015 10:43 PM)kharpster Wrote: Salvo, hi, yes, I think they now have uniformed the method of calc to that in the HP 12C. In 12C I get result like mine giving i/12=6.5, n=0, PV=150000, FV=0, PMT=948.10, with minus sign (important) (this can be solved in the Prime, or calculating by 12C putting n*12=30, that's n=360); then using 12, f+Amort I get the value for interest, with x<>y that for principal, with RCT PV the residual amount, and so on giving again 12 f+Amort... So the result now is equal to that in the 12C, giving 12 as 12 is an year (12 months)... Yes, I think that, a part of the choose for Group Size, it would be interesting to have also a choose for grouped or accumulative list... I would like much to have also a complete Cash Flow routine in the Prime, like that in the 12C, I hope to test a program. For now there is NPV (from Eddie Shore), that calculates Net Present Value; it would be nice to add also an IRR (Internal Rate of Return) function to it... Salvo ∫aL√0mic (IT9CLU), HP Prime 50g 41CX 71b 42s 12C 15C  DM42 WP34s :: Prime Soft. Lib 

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