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HP HP-21 - Storage Register Arithmetic

HP HP-21
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Solution:
Press
Display
1
EE
.05
Stores
constant
0.95
(95%)
in
(=]
storage
register.
1000
[x]
950.00
Amount
customer
will
pay
for
first
item.
2000
(%]
1900.00
Amount
customer
will
pay
for
second
item.
3000
(x]
2850.00
Amount
customer
will
pay
for
third
item.
5700.00
Total
cost.
Storage
Register
Arithmetic
Arithmetic
is
performed
using
the
storage
register
by
pressing
the
MM
key
as
illustrated
above.
Arithmetic
is
performed
upon
the
contents
of
the
storage
register
by
pressing
the
blue
shift
key
and
either
[w], [w],
[w],
or
[v].
Press
Result
e
Number
in
X-register
added
to
contents
of
the
storage
register.
B
(v]
Number
in
X-register
subtracted
from
the
storage
register
contents.
B
(»x]
Number
in
X-register
multiplied
by
the
number
in
the
storage
register,
and
the
product
placed
into
the
storage
register.
B
(1]
Storage
contents
divided
by
number
in
X-register
and
the
quotient
placed
into
the
storage
register.
Example:
During
harvest,
farmer
Flem
Snopes
hauls
tomatoes
to
the
cannery
for
three
days.
On
Monday
and
Tuesday
he
hauls
loads
of
45
tons,
47
tons,
49
tons,
and
43
tons,
for
which
the
cannery
pays
him
$55 per
ton.
On
Wednesday
the
price
rises
to
$57.50
per
ton,
and
Snopes
ships
loads
of
46
tons
and
48
tons.
If
the
cannery
deducts
2%
of
the
price
on
Monday
and
Tuesday
because
of
blight
on
the
tomatoes,
and
3%
of
the
price
on
Wednesday,
what
is
Snopes’
total
net
income?
Method:
Keep
total
amount
in
the
storage
register
while
using
the
stack
to
add
tonnages
and
calculate
amounts
of
loss.

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