Texas Instruments BA-20 Profit Manager User Manual - Page 75

Example: Computing Percent Change, Example: Computing Compound Interest

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3. To enter values for the known variables, press # or " until the 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: OLD, NEW, and %CH. Leave #PD set to 1. • Compound Interest - Enter values for three of these four variables: OLD, NEW, %CH, and #PD. • Cost-Sell-Markup - Enter values for two of these three variables: OLD, NEW, and %CH. Leave #PD set to 1. 4. To compute a value for the unknown variable, press # or " until the 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 Press Display Select Percent Change/Compound & q Interest worksheet. OLD= Enter original forecast amount. 658 ! OLD= Enter actual amount. # 700 ! NEW= Compute percent change. # % %CH= Enter -7 as percent change. 7 S ! %CH= Compute new actual amount. " % NEW= 0 658.00 700.00 6.38 -7.00 611.94 Answer: $700 represents a 6.38% increase over the original forecast of $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 Press Display Select Percent Change/Compound & q Interest worksheet. OLD= Enter stock purchase price. 500 ! OLD= Enter stock selling price. # 750 ! NEW= 0 500.00 750.00 Other Worksheets 71

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Other Worksheets
71
3.
To enter values for the known variables, press
#
or
"
until the
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:
OLD
,
NEW
, and
%CH
. Leave
#PD
set to 1.
•
Compound Interest
— Enter values for three of these four
variables:
OLD
,
NEW
,
%CH
, and
#PD
.
•
Cost-Sell-Markup
— Enter values for two of these three
variables:
OLD
,
NEW
, and
%CH
. Leave
#PD
set to 1.
4.
To compute a value for the unknown variable, press
#
or
"
until the
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.
Answer:
$700 represents a 6.38% increase over the original forecast of
$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
Press
Display
Select Percent Change/Compound
Interest worksheet.
& q
OLD=
0
Enter original forecast amount.
658
!
OLD=
658.00
Enter actual amount.
#
700
!
NEW=
700.00
Compute percent change.
# %
%CH=
6.38
Enter
-
7 as percent change.
7
S !
%CH=
-7.00
Compute new actual amount.
" %
NEW=
611.94
To
Press
Display
Select Percent Change/Compound
Interest worksheet.
& q
OLD=
0
Enter stock purchase price.
500
!
OLD=
500.00
Enter stock selling price.
#
750
!
NEW=
750.00