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Functlo~
Keys
57
Storage Register Arithmetic
Arithmetic
is performed
upon
the
con
tents
of
th
e sto rage regis
-
ster by pressing
llmJ
followed by the
arithmetic function
key
followed in
turn
by the
register
address. For
example:
Press
llmJ
I:±ll
Result
Number
in displ
ayed
X-register added to con-
tents of storage register
R
"
and
SUm placed into
R , :
(r ,
+
x
--'>
R , ).
Number in displ
ayed
X-register
subtracted from
contents of storage register
R
2 ,
and
difference
placed into R
2 :
(r
2
-
x
--'>
Rz).
Number
in
dis
played X-register mUltiplied by
contents
of storage register R
3 ,
and
the product
placed into
R:J:
[
(r
3 )
x
--'>
R
3 ].
Contents of storage register
R4
divided by number
in displayed
X-register
,
and quotient
placed into
R
4 :
(r
4
-7
x
--'>
R,)
,
When
storage
regi ster
arithmetic operations
are
performed,
the
answer
is written
into
the
selected storage
register
,
while the
contents
of the
displayed X-register and the
rest
of
the
stack
rema
in unchanged
.
Example:
During harvest
, a
farmer
trucks
tomatoes to
the
cannery
for
three days. On Monday
and
Tuesday
he hauls
loads
of25
tons
,
27 ton
s,
19
tons, and 23 tons,
for
which the
cannery
pays him $55 per
to
n. On Wednesday the price rises to
$57.50
per
ton, and
he
ships
loads
of26
tons
and
28 ton
s.
If the cannery
deducts
2% of
the price
on Monday and
Tue
sday
because
of
blight
on
the tomatoes
,
and
3%
of the
price
on Wednesday, what
is
the
farmer's
tota
l net income
?
Method: Keep
total
a
mount in
a
storage
register
while
using the
stack
to
add
tonnages
and calculate amounts of
loss
.
Press
Display
25
IDa
271:±l
191:±l231:±l
, - - , I
9
:....: 4=
.0
"'-
0_----'
550
15170.00
Total of Monday's and
Tuesday's
tonnage.
Gross amount for Monday
and
Tuesday.
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