SR-56 Annuity Program - Interest Rate Known
This program is taken from the SR-56 Applications Book, by Texas Instruments.

This will solve for the N, PV, or PMT components of the Time Value of Money equation where the interest rate is known. To solve the TVM problem involving a Future Value, see: SR-56 Future Values

Instructions:
1) Clear memories. 2nd Cms.
2) Load known values (you need to enter three of these) into data memories. Interest rate per period, STO 1, Present Value STO 2, Payment per period, STO 3, Number of periods STO 4.
3) Calculate the unknown value, press RST, R/S. The unknown value is automatically calculated and displayed.

Program Listing:
```Line  Keycode  Instruction
00      15       CLR
01      32       X <> T
02      49       FIX
03      02       2
04      34       RCL
05      01       1
06      54       /
07      01       1
08      00       0
09      00       0
10      94       =
11      33       STO
12      00       0
13      34       RCL
14      04       4
15      37       X = T
16      07       7
17      00       0
18      01       1
19      74       -
20      52       (
21      01       1
22      84       +
23      34       RCL
24      00       0
25      53       )
26      45       Y^X
27      34       RCL
28      04       4
29      93       +/-
30      94       =
31      54       /
32      34       RCL
33      00       0
34      37       X = T
35      05       5
36      05       5
37      94       =
38      33       STO
39      05       5
40      20       1/X
41      33       STO
42      06       6
43      34       RCL
44      03       3
45      37       X = T
46      06       6
47      01       1
48      64       *
49      34       RCL
50      05       5
51      94       -
52      33       STO
53      02       2
54      41       R/S
55      15       CLR
56      34       RCL
57      04       4
58      22       GTO
59      03       3
60      08       8
61      34       RCL
62      02       2
63      64       *
64      34       RCL
65      06       6
66      94       =
67      33       STO
68      03       3
69      41       R/S
70      34       RCL
71      00       0
72      54       /
73      34       RCL
74      03       3
75      64       *
76      34       RCL
77      02       2
78      93       +/-
79      84       +
80      01       1
81      94       =
82      13       LNX
83      33       STO
84      04       4
85      01       1
86      84       +
87      34       RCL
88      00       0
89      94       =
90      13       LNX
91      93       +/-
92      12       INV
93      30       PROD
94      04       4
95      34       RCL
96      04       4
97      41       R/S
```

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