Texas Instruments BA II Plus User manual


BA II PLUS™
Calculator
©1997, 2002 Texas Instruments Incorporated

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Important
Texas Instruments makes no warranty, either expressed or implied,
including but not limited to any implied warranties of merchantability
and fitness for a particular purpose, regarding any programs or book
materials and makes such materials available solely on an “as-is” basis.
In no event shall Texas Instruments be liable to anyone for special,
collateral, incidental, or consequential damages in connection with or
arising out of the purchase or use of these materials, and the sole and
exclusive liability of Texas Instruments, regardless of the form of
action, shall not exceed the purchase price of this calculator. Moreover,
Texas Instruments shall not be liable for any claim of any kind
whatsoever against the use of these materials by any other party.
US FCC Information Concerning Radio Frequency Interference
This equipment has been tested and found to comply with the limits for
a Class B digital device, pursuant to Part 15 of the FCC rules. These
limits are designed to provide reasonable protection against harmful
interference in a residential installation. This equipment generates, uses,
and can radiate radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful interference with
radio communications. However, there is no guarantee that interference
will not occur in a particular installation.
If this equipment does cause harmful interference to radio or television
reception, which can be determined by turning the equipment off and
on, you can try to correct the interference by one or more of the
following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that
to which the receiver is connected.
• Consult the dealer or an experienced radio/television technician for
help.
Caution: Any changes or modifications to this equipment not expressly
approved by Texas Instruments may void your authority to operate the
equipment.

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1: Overview of Calculator Operations 1
Turning the Calculator On and Off.............................. 2
Resetting the Calculator ....................................... 3
Keys and 2nd Functions ....................................... 4
The Display .................................................. 4
Display Indicators ............................................ 5
Setting Calculator Formats .................................... 6
Clearing the Calculator ........................................ 11
Correcting Entry Errors ....................................... 12
Math Operations .............................................. 13
More on Selected Math Operations ............................. 15
Memory Operations ........................................... 17
Calculations Using Constants .................................. 19
Last Answer Feature .......................................... 20
Using Worksheets: Tools for Financial Solutions ................ 21
Types of Worksheets .......................................... 22
Worksheet Variables .......................................... 22
Clearing Worksheets and Setting Defaults ...................... 26

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2: Time-Value-of-Money and Amortization Worksheets 27
TVM and Amortization Worksheet Labels.................... 28
Time-Line Diagrams ..................................... 32
Procedure: Using the TVM Worksheet ...................... 33
Procedure: Generating an Amortization Schedule ............. 34
Procedure: Automatically Generating a Schedule ............. 35
Basic Loan Calculations—Interest ......................... 36
Basic Loan Calculations—Payments........................ 37
Future Value of Savings .................................. 38
Present Value of Savings ................................. 39
Present Value in Present-Value Annuities .................... 40
Perpetual Annuities ..................................... 42
Variable Cash Flows..................................... 44
Lease-or-Buy Decision ................................... 46
Present Value of Lease with Residual Value .................. 48
Monthly Payments ...................................... 49
Yield to Maturity on Bond Purchased on Interest Date ......... 50
Saving for the Future by Making Monthly Deposits ............ 51
Amount to Borrow and Down Payment ..................... 52
Regular Deposits for a Specified Future Amount .............. 53
Time Value of Money/Amortization Schedule ................. 54
Interest and Loan Balance after Specified Payment ............ 56
Canadian Mortgages..................................... 57
3: Cash Flow Worksheet 59
Cash Flow Worksheet Labels ............................. 60
Interpreting the Results of IRR Calculations.................. 61
Uneven and Grouped Cash Flows .......................... 62
Entering Cash Flows .................................... 63
Deleting Cash Flows .................................... 64
Inserting Cash Flows .................................... 65
Computing NPV and IRR ................................. 66
Uneven Cash Flows ..................................... 67
Value of a Lease with Uneven Payments..................... 70

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4: Bond Worksheet 73
Terminology ........................................... 76
Entering Bond Data and Computing Results.................. 77
Bond Price and Accrued Interest Example ................... 79
5: Depreciation Worksheet 81
Depreciation Worksheet Labels............................ 82
Entering Data and Computing Results ...................... 84
Declining Balance with Straight-Line Crossover Example .......... 85
Straight-Line Depreciation Example ........................ 86
6: Statistics Worksheet 87
Statistics Worksheet Labels............................... 88
Regression Models ...................................... 90
Entering Statistical Data ................................. 91
Editing Statistical Data .................................. 92
Computing Statistical Results ............................. 93
One-Variable Statistics Example ........................... 95
Two-Variable Statistics Example........................... 96
7: Other Worksheets 99
Percent Change/Compound Interest Worksheet............... 100
Interest Conversion Worksheet ............................ 104
Date Worksheet ........................................ 106
Profit Margin Worksheet ................................. 108
Breakeven Worksheet ................................... 110
Memory Worksheet ..................................... 112

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Appendix: Reference Information 115
Formulas ............................................. 116
Error Conditions ....................................... 125
Accuracy Information ................................... 128
IRR Calculations ....................................... 129
AOSé(Algebraic Operating System) Calculations............. 131
Battery Information ..................................... 132
In Case of Difficulty ..................................... 133
Texas Instruments (TI) Support and Service Information ....... 134
Texas Instruments (TI) Warranty Information ................ 135
Index 137

1: Overview of Calculator Operations 1
1
Overview of Calculator Operations
This chapter contains information on:
• Basic calculator operation
• Clearing and correcting
• Math operations
• Memory
• Last Answer
• Worksheets

2 BA II PLUS™ Calculator
Turning the Calculator On and Off
Turning the Calculator On
Press $to turn the calculator on.
• If you turned the calculator off by pressing $, the
calculator returns to operation in the standard-calculator
mode. A value of zero is displayed and the values in all of
the worksheets are the same as you left them, as are the
formats for numbers, angle units, dates, separators, and
calculation method.
• If the APD™ feature turned the calculator off, the
calculator, including the display and any error condition,
returns exactly as you left it.
Turning the Calculator Off
When you press $to turn the calculator off:
• The displayed value is cleared.
• Any unfinished standard-calculator operation is canceled.
• Any worksheet calculation in progress is canceled.
• Any error condition is cleared.
• The Constant Memory™ feature retains all worksheet values
and settings, including the contents of the 10 memories and
all format settings.
Automatic Power Down™ (APD™) Feature
To prolong the life of the battery, the Automatic Power Down
(APD) feature turns the calculator off automatically if you do
not press any key for approximately 10 minutes.

1: Overview of Calculator Operations 3
Resetting the Calculator
Resetting the calculator restores all default settings and clears
all data. Because you can clear only selected portions of data,
you should reserve the reset function for appropriate situations.
You might choose to reset when you first purchase the
calculator or when you start a new project.
Effects of Resetting
• Clears the display and any unfinished calculation.
• Clears all 10 memories.
• Clears all worksheet data and restores the default settings.
(For information on specific worksheets, refer to the
specific worksheet chapters.)
• Returns the calculator to the standard-calculator mode.
Alternatives to Resetting
Before resetting the calculator, consider the other methods for
clearing described in this chapter. For example, if you need to
clear only one worksheet, you can do so without resetting.
Procedure: Resetting the Calculator
If necessary, first press Pto clear any error condition.
쐃Press &}.
RST ? and the ENTER indicator are displayed.
쐇To reset the calculator, press !. RST and 0.00 are
displayed.
Note: To cancel the reset operation instead, press &U. 0.00 is
displayed.
The calculator is in standard-calculator mode.

4 BA II PLUS™ Calculator
Keys and 2nd Functions
The primary function of each key is printed on the key. For
example, press $to turn the calculator on or off.
Some keys provide a secondary function. which is printed in
yellow above the key. When you press &, the character,
abbreviation, or word printed above a key becomes active for
the next keystroke. For example, press &Uto leave a
worksheet and return to standard-calculator mode.
The Display
The display shows entries and results with up to 10 digits. The
indicators along the top of the display provide information
about the status of the calculator and tell you what keys are
available at different times.
ABC represents the spaces where the three-letter abbreviations
for the variable labels are displayed.