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HP HP-25 - Percentages

HP HP-25
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54
Eiinrtion
Kave
o4
runcton
Keys
Percentages
The
key
is
a
two-number
function
that
allows
you
to
compute
percentages.
To
find
the
percentage
of
a
number;
1.
Key
in
the
base
number.
2.
Press
Bz
-
3.
Key
in
the
number
representing
percent
rate.
4.
Press
]
[%].
For
example,
to
calculate
a
sales
tax
of
6.5%
on
a
purchase
of
$1500:
Press
Display
1500
1500.00
Base
number.
6.5
Percent
rate.
B8
The
answer.
6.5%
of
$1500
is
$97.50.
In
the
above
example,
when
the
B} %]
keys
are
pressed,
the
calculated
answer
writes
over
the
percentage
rate
in
the
X-
register,
and
the
base
number
is
preserved
in
the
Y-register.
When
you
pressed
[l
[%],
the
stack
contents
were
changed
. . .
...
fromthis
..
. .
.
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
price
is
now
in
the
Y-register
and
the
amount
of
tax
is
in
the
X-register,
the
total
amount
can be
obtained
by
simply
adding:
Press
Display
1597.50
Total
of
price
and
sales
tax
combined.

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