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HP HP-67 - Page 169

HP HP-67
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Program
Editing
165
The
following
program
is
used
by
the
manager
of
a
savings
and
loan
company
to
compute
the
future
amounts
of
savings
accounts
according
to
the
formula
FV
=
PV
(1
+i)",
where
FV
is
future
value
or
amount,
PV
is
present
value,
i
is
the
periodic
interest rate
expressed
as
a
decimal,
and
7
is
the
number
of
periods.
With
PV
entered
into
the
Y-register,
n
keyed
into
the
X-register,
and
an
annual
standard
interest
rate
of
7.5%,
the
program
is:
001
[
(0@
002
003
004
(4
005
(9
006
007
(5
008
009
03
010
0
o117
B
012
[
(rRTN
a.
Load
the
program
into
the
calculator.
b.
Run
the
program
to
find
the
future
amount
of
$1,000
invested
for
5
years.
(Answer:
$1,435.63)
Of
$2,300
invested
for
4
years.
(Answer:
$3,071.58)
c.
Alter
the
program
to
account
for
a
change
of
the
annual
interest rate
from
7.5%
to
8%.
d.
Run
the
program
for the
new
interest
rate
to
find
the
future
value
of
$500
invested
for
4
years;
of
$2,000
invested
for
10
years.
(Answer:
$680.24;
$4,317.85)

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