HP 12c Platinum Owner's Handbook

174 Appendix A: RPN and the Stack
In the example above, the constant was repeatedly multiplied by the result of the
previous operation, which was already in the displayed X-register. In another
class of calculations with constants, the constant is multiplied by (or added to,
etc.) a new number keyed into the displayed X-register. For these calculations,
you must press O before keying in a new number after having pressed an
operator key. If this were not done, the stack would lift when you keyed in a new
number after pressing the operator key, and the Y-register would no longer con-
tain the constant. (Recall – from page 168 – that the stack does not lift when a
number is keyed into the displayed X-register after O is pressed.)
Example: At Permex Pipes a certain pipe fitting is packaged in quantities of 15,
75, and 250. If the cost per fitting is $4.38, calculate the cost of each package.
3
Keystrokes (RPN mode) Display
2\\
\
2.00
Enters constant into Y-, Z-, and
T-registers.
84000
84,000.
Enters base amount into displayed
X-register.
§
168,000.00
Annual sales after first year.
§
336,000.00
Annual sales after second year.
§
672,000.00
Annual sales after third year.
3.
You may want to compare this method of arithmetic calculations with constants to the
method using F
described on page 74.
Keystrokes (RPN mode) Display
4.38\\
\
4.38
Enters constant into Y-, Z-, and
T-registers.
15
15.
Enters first quantity into displayed
X-register.
§
65.70
Cost of a package of 15.
O75
75.
Clears display and enters second
quantity into displayed X-register.
§
328.50
Cost of a package of 75.
O250
250.
Clears display and enters third
quantity into displayed X-register.
§
1,095.00
Cost of a package of 250.

HP 12c Platinum Specifications

General

Digits	10 digits
Battery type	CR2032
Type	Financial
Form factor	Pocket

Weight and Dimensions

Weight	110 g
Dimensions (WxDxH)	79 x 129 x 15 mm