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Dieter · (This post was last modified: 09-25-2018 04:29 PM by Dieter.)

(09-25-2018 10:24 AM)Gamo Wrote: This program is the "Discount Cash Flow Analysis" to find NPV or
Net Present Value.

Yes, it's a regular NPV program. Not a special program to assess buy-or-lease decisions. Maybe you should explain how the program is used: what exactly do the A, B, C and D keys do and what is the input and output?

(09-25-2018 01:28 PM)Albert Chan Wrote: If numbers are allowed to input backwards, NPV can be much simpler, with Horner's rule:
Discount rate = 1.15 (stored in memory 0):

2270 RCL-0 /
1815 + RCL-0 /
1375 + RCL-0 /
948 + RCL-0 /
533 + RCL-0 /

I assume that "RCL–0" does not really mean RCL–0 (recall arithmetic, not supported by the 11C) but simply "RCL 0". ;-)

Yes, the Horner method works nicely here, but why do you want to do it this complicated?

1,15 [1/x] [ENTER] [ENTER] [ENTER]
2270 [x]
1815 [+] [x]
1375 [+] [x]
948 [+] [x]
533 [+] [x]

=> 4250,71

Good old RPN practice. ;-)

(09-25-2018 01:28 PM)Albert Chan Wrote: We get the same NPV of 4250.71, without using X^Y

Even without RCL 0 and less keystrokes. ;-)

Dieter