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Texas Instruments Titanium TI-89 User Manual

Texas Instruments Titanium TI-89
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Activities 770
Finding the Interest Rate of an Annuity
Finding the Interest Rate of an AnnuityFinding the Interest Rate of an Annuity
Finding the Interest Rate of an Annuity
Perform the following steps to find the interest rate (
i) of an annuity where the starting
principal (
p) is 1,000, number of compounding periods (n) is 6, and the future value (s) is
2,000.
1. On the Home screen, enter the equation
to solve for
p.
2. Enter the equation to solve for
n.
3. Enter the equation to solve for i using the
with operator.
solve(s=p(1+i)^n,i) | s=2000 and p=1000
and n=6
Result: The interest rate is 12.246%.
Note:
To enter the “with” ( | ) operator: Í
Press 8 ¸ to obtain a floating-
point result.

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Texas Instruments Titanium TI-89 Specifications

General IconGeneral
Display TypeLCD
Display Resolution160 x 100 pixels
Memory188 KB RAM, 2.7 MB Flash ROM
TypeGraphing Calculator
DisplayMonochrome
ProcessorMotorola 68000
Processor Speed12 MHz
Power Source4 AAA batteries
ConnectivityUSB
ProgrammingTI-BASIC, Assembly
Operating SystemAMS (Advanced Mathematics Software)

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