(11C) TVM for HP-11C
05-09-2019, 01:15 AM (This post was last modified: 05-09-2019 12:40 PM by Gamo.)
Post: #1
 Gamo Senior Member Posts: 605 Joined: Dec 2016
(11C) TVM for HP-11C
TVM program that work just like HP-12C.

Program credit to Gene Wright's website
https://www.rskey.org/gene/hpgene/tvm19c.htm

As mentioned in Gene Wright page this program originally appeared in the
May 1980 PPC Journal written by Robert Meyer.
The program will run as written on an HP-19C/29C

Since 19C doesn't have specific Labels.
I modify this program so that Labels A to E located at the same position as on HP-12C
With added-on Labels and use many Store Registers this took me awhile
to make this program work since 11C got limited program space when
use a lot of store memory registers.

Finally I have successfully fit this program to work on 11C
at which it use 111 program lines at its maximum limit.

Lastly this might be an excellent TVM program for 11C compare to that of
the more sophisticated TVM program available in the 15c advanced functions handbook
that use SOLVE function to solve for unknown interest.

TVM for HP-11C program:

Gamo
12-03-2019, 10:12 AM (This post was last modified: 12-03-2019 10:14 AM by Gamo.)
Post: #2
 Gamo Senior Member Posts: 605 Joined: Dec 2016
RE: (11C) TVM for HP-11C
Last post I didn’t give an example on how to use this TVM program.

These two example are from the HP-12C User’s Handbook.

—————————————————————————————-
USER mode with FIX 2

What annual interest rate must be obtained to accumulate $10,000 in 8 years on an investment of$6,000 with quarterly compounding?

8 [ENTER] 4 [x] [A] display 32.00. // Calculates and stores n.

6000 [CHS] [C] display –6,000.00 // Stores PV (with minus sign for cash paid out).

10000 [E] display 10,000.00 // Stores FV.

[B] [R/S] display 1.61 // Periodic (quarterly) interest rate.

4 [x] display 6.44 Annual interest rate.

Remark:
This problem is in END mode the default setting with 0 on Register .0
——————————————————————————————

If you deposit \$50 a month (at the beginning of each month) into a
new account that pays 6 1/4% annual interest compounded monthly, how much will
you have in the account after 2 years?

Beginning Mode set 1 on Register .0 // ( 1 [STO] .0 )

2 [ENTER] 12 [x] [A] display 24.00 // Calculates and stores n.

6.25 [ENTER] 12 [÷] display 0.52 // Calculates and stores i.

50 [CHS] [D] display –50.00 // Stores PMT (with minus sign for cash paid out).

[E] [R/S] display 1,281.34 // Balance after 2 years.
—————————————————————————————-

Gamo
02-13-2020, 06:14 AM (This post was last modified: 02-13-2020 11:30 AM by Gamo.)
Post: #3
 Gamo Senior Member Posts: 605 Joined: Dec 2016
RE: (11C) TVM for HP-11C
Interest Rate Solver Solutions for

1. Direct Reduction Loan Interest Rate with known [n, PV and PMT]
2. Sinking Fund Interest Rate with known [n, FV and PMT]

This program is adapted form the HP-55 Mathematic Programs

----------------------------------------
Procedure: [USER] mode [FIX] 2

Input n [A] PV or FV [ENTER] PMT [R/S] Your Guess [R/S]

For Suggested Guess

Problem with PV use [B]
Problem with FV use [D]

[C] Solve for Direct Reduction (Problem involve PV and PMT)
[E] Solve for Sinking Fund (Problem involve FV and PMT)
-------------------------------------------
Example:

1. Problem involve: n, PV and PMT

n=12
PV=5,000
PMT=500

12 [A] 5000 [ENTER] 179.86 [R/S] display 27.80

Use Suggested Guess: [B] display 3.06%

----------------------------------------
2. Problem involve: n, FV and PMT

n=12
FV=5,000
PMT=400

12 [A] 5000 [ENTER] 400 [R/S] display 8.33

Use Suggested Guess [D] display 0.75%

 LBL A STO 1  // n R/S ÷  STO 3  // PV or FV ÷ PMT R/S EEX 2 ÷ STO 2  // Your Guess EEX 2 x R/S ------- LBL B  // Suggested Guess for problem PV / PMT 1/x RCL 1 X^2 1/x RCL 3 x - STO 2 EEX 2 x RTN ------ LBL C  // Calculate i for problem PV /PMT RCL 3 RCL 2 x 1 RCL 2 1 + RCL 1 CHS Y^X STO 5 - - RCL 1 RCL 2 1/x 1 + ÷ 1 + RCL 5 x 1 - RCL 2 ÷ ÷ STO+2 X^2 EEX 1 2 CHS X≤Y GTO C RCL 2 EEX 2 x RTN ------ LBL D  // Suggested Guess for problem FV / PMT RCL 3 RCL 1 - 2 x RCL 1 1 - X^2 RCL 3 + ÷ STO 2 EEX 2 x RTN ------- LBL E  // Calculate i for problem FV / PMT RCL 3 RCL 2 x 1 + RCL 2 1 + RCL 1 Y^X STO 4 - RCL 1 1 RCL 2 1/x + ÷ 1 - RCL 4 x 1 + RCL 2 ÷ ÷ STO+2 X^2 EEX CHS 1 2 X≤Y GTO E RCL 2 EEX 2 x RTN