HP 25 User Manual

Functlo~ Keys 57
Storage Register Arithmetic
Arithmetic is performed upon the conte nts of the sto ra ge r eg is-
ster
by pressing llmJ followed by the arithmetic function key
followed in
turn by the register a ddress. For example:
Press
llmJ I:±ll
Result
Number in displ ayed X-register added to con-
tents of storage register R
"
and S Um placed into
R
,
: (r , + x --'> R
,
).
Number in displ ayed X-register s ubtracted from
contents of storage register R
2
,
and difference
placed into R
2
:
(r
2
- x --'> Rz).
Number in displayed 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 dis pl ay ed X-register , and quotient placed into
R
4
:
(r
4
-7 x --'> R,),
When storage regis ter 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 truck s 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 ton. On Wednesday the price rises to $57.50
per ton, and he ships loads of26 tons and 28 ton s. If the cannery
deduct s 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 tot al net income ?
Method: Keep total a mount in a storage register while using the
stack to add tonn ages and calculate amounts of loss.
Press
Display
25 IDa 271:±l
191:±l231:±l ,--,I 9 :....: 4=.0"'-0 _----'
550 1 5170.00
Total of Monday's and
Tuesday's tonn age.
Gross amount for Monday
and Tuesday.

HP 25 Specifications

General

Power Source	Rechargeable battery pack
Programming Steps	49
Release Year	1975
Functions	Trigonometric, logarithmic, statistical
Type	Scientific
Dimensions	148 x 80 x 14 mm