HP 25 User Manual

54 Function Keys
Percentages
The [JJ key is a two-numb er function that allows you to
compute percentages . To find the percentage of a number ;
1. Key in the base number.
2. PresslmimJ.
3. Key in the number representing percent rate .
4. Press III [JJ .
For examp le, to ca lc ul ate a sa l es tax of 6.5% on a purchase of
$1500:
Press Display
1500 ImimJ 1 1500 .00
6.5 ;::: 16=.5= = =!
III [JJ L.::: 1 9 ~ 7. ~ 50 ~ _
6.5% of $1500 is $97.50.
Base number.
Percent rate .
The answer.
In the above examp l e, when the III [JJ keys are pressed , the
ca lcul ated answer writes over the percentage r ate in the X-
reg
ister , and the base number is preserved in the Y -r egister.
When you pressed III [JJ , the stack contents were changed .. .
. . . from this ...
. . . to this .
T
0.00
T
0.00
Z
0.00
Z
0.00
Y
1500.00 Y
1500.00
X
6.5
X
97 . 50
Since the purchase p ri ce is now in the Y -r egister and the a mount
of tax is in the X-regis ter , the total amount can be obt a ined by
s imply adding:
Press
Display
11597.50
Total of price and sa les tax combined.

HP 25 Specifications

General

Power Source	Rechargeable battery pack
Programming Steps	49
Release Year	1975
Functions	Trigonometric, logarithmic, statistical
Type	Scientific
Dimensions	148 x 80 x 14 mm