Texas Instruments Calculator User Manual page 77

To enter values for the known variables, press # or " until the
3.
variable you want is displayed, then key in a value, and press !.
(Do not enter a value for the variable you wish to solve.)
• Percent Change — Enter values for two of these three
variables:
• Compound Interest — Enter values for three of these four
variables:
• Cost-Sell-Markup — Enter values for two of these three
variables:
To compute a value for the unknown variable, press # or " until the
4.
variable you want is displayed and press %. The calculator displays
the value.
Example: Computing Percent Change
First, determine the percentage change from a forecast amount of $658
to an actual amount of $700. Second, determine what the new amount
would be if it were 7% below the original forecast.
To
Select Percent Change/Compound
Interest worksheet.
Enter original forecast amount.
Enter actual amount.
Compute percent change.
Enter -7 as percent change.
Compute new actual amount.
$700 represents a 6.38% increase over the original forecast of
Answer:
$658. A decrease of 7% would result in a new actual amount of $611.94.
Example: Computing Compound Interest
You purchased stock in 1995 for $500. Five years later, you sell the stock
for $750. What was the annual growth rate?
To
Select Percent Change/Compound
Interest worksheet.
Enter stock purchase price.
Enter stock selling price.
Other Worksheets
, , and
OLD NEW
, ,
OLD NEW %CH
, , and
OLD NEW
. Leave
%CH #PD
, and .
#PD
. Leave
%CH #PD
Press
& q
!
658
# !
700
# %
S !
7
" %
Press
& q
!
500
# !
750
set to 1.
set to 1.
Display
OLD=
OLD=
658.00
NEW=
700.00
%CH=
%CH=
NEW=
611.94
Display
OLD=
OLD=
500.00
NEW=
750.00
0



6.38

-7.00

0


73