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4 Getting Started
8200GETS.DOC TI-82, Getting Started, English Bob Fedorisko Revised: 02/09/01 8:38 AM Printed:
02/09/01 12:35 PM Page 4 of 14
Entering a Calculation: Compound Interest
Using trial and error, determine when an amount invested at 6% annual
compounded interest will double in value. The TI
.
82 displays up to 8 lines of 16
characters so you see an expression and its solution at the same time. You also
can store values to variables, enter multiple instructions on one line, and recall
previous entries.
1. Press
.06
¿
ƒ
Z
(annual interest rate) to
store the interest rate.
2. Press
y
ã
:
ä
to enter more than one instruction
on a line.
3. For the first guess, compute the amount
available at the end of 10 years. Enter
10
¿
ƒ
Y
(years).
4. Press
y
ã
:
ä
, then enter the expression to
calculate the total amount available after
Y
years at
Z
interest just as you would write it. Use
1000 as the amount. Press
1000
¯
£
1
Ã
ƒ
Z
¤
ƒ
Y
.
The entire problem is shown in the first two
lines of the display.
5. Press
Í
to evaluate the expression.
The answer is shown on the right side of the
display. The cursor is positioned on the next
line, ready for you to enter the next expression.
6. To save keystrokes, you can use
Last Entry
to
recall the last expression entered and then edit
it for a new calculation. Press
y
, followed by
ã
ENTRY
ä
(above
Í
).
The last calculated expression is shown on the
next line of the display.
14


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