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HP HP-18C - Page 130

HP HP-18C
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Each
menu
label
represents
a user-variable created
by
the
solver.
You
can
store
numbers
into
these
variables
and
do
calculations
the
same
way
you use
other
menus
and
their
built-in
variables.
Example: Entering a formula and using a custom menu.
Part
1.
Use
the
formula
on
page
127 to create
the
custom
menu
shown
in
figure 9-1.
Then,
calculate
the
cost
of
carpet
needed
to cover a
9'
by
12'
room
.
The
carpet
costs $22.50
per
square
yard
.
Part
2.
Determine
the
most
expensive
carpet
you
can
buy
if
the
max-
imum
amount
you
can
pay
to
carpet
the
room
is $300.
Starting
from
the
MAIN
menu:
Keys:
PPSY 0 L 0
W[I]9G]
Display:
COST
.PP8yxLxW+9=C08T
22
.50
&m
9_
12 _
IBII
PP8Y=22,50
1~=9,
00
L=12
,
00
C08T=270,00
Description:
Displays
the
SOLVE
menu
and
bottom
of
the
formula
list.
Formula
typed
into
cal-
culator line.
*
Enters
the
formula
and
displays
the
custom
menu
.
Stores
the
price
per
square
yard
in
PPSY.
Stores
the
width.
Stores
the
length.
Calculates
the
cost.
Part
2: Calculate
the
most
you
can
pay
per
square
yard to
carpet
the
room
for $300.
300
1B11
&m
C08T=300,00
PP8Y=25
,
00
Stores $300 in COST.
Calculates
the
maximum
price
per
square
yard
you
can
pay
.
You
mu
st use the multiplication key
(0)
,
and
not the
alphab
etic
[]]
k
ey,
to
ent
er the
"times' sign.
128
9:
The
Formula
Solver

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