This program is taken from the SR-56 Applications Book, by Texas Instruments.

This will solve for the periodic interest rate given the N, PV, and PMT
components of the Time Value of Money. **Remember:** The periodic
interest rate is NOT the annual rate. If you are solving for the
interest rate and the payments are monthly, you will get a monthly
interest rate as the answer. To convert to an annual rate, you will have
to multiply by 12! 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. Present Value STO 2, Payment per period, STO 3, Number of
periods STO 4.

3) Calculate the periodic interest rate by pressing RST, R/S. The
interest rate per period is automatically calculated and displayed.

Line Keycode Instruction 00 56 CP 01 15 CLR 02 34 RCL 03 03 3 04 54 / 05 34 RCL 06 02 2 07 74 - 08 20 1/X 09 33 STO 10 05 5 11 54 / 12 34 RCL 13 04 4 14 43 X^2 15 94 = 16 37 X = T 17 09 9 18 04 4 19 33 STO 20 01 1 21 34 RCL 22 01 1 23 64 * 24 34 RCL 25 05 5 26 74 - 27 52 ( 28 01 1 29 74 - 30 52 ( 31 01 1 32 84 + 33 34 RCL 34 01 1 35 53 ) 36 45 Y^X 37 34 RCL 38 04 4 39 93 +/- 40 53 ) 41 33 STO 42 06 6 43 94 = 44 54 / 45 52 ( 46 34 RCL 47 06 6 48 54 / 49 34 RCL 50 01 1 51 74 - 52 52 ( 53 34 RCL 54 04 4 55 64 * 56 52 ( 57 01 1 58 84 + 59 34 RCL 60 01 1 61 53 ) 62 45 Y^X 63 52 ( 64 34 RCL 65 04 4 66 93 +/- 67 74 - 68 01 1 69 94 = 70 12 INV 71 35 SUM 72 01 1 73 28 | X | 74 74 - 75 04 7 76 93 +/- 77 19 10^X 78 94 = 79 47 X >= T 80 02 2 81 01 1 82 34 RCL 83 01 1 84 49 FIX 85 06 6 86 44 EE 87 12 INV 88 44 EE 89 33 STO 90 01 1 91 64 * 92 02 2 93 19 10^X 94 49 FIX 95 02 2 96 41 R/S 97 42 RST

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