HP 12C User Manual page 236

236 Appendix A: RPN and the Stack
Keystrokes
(RPN mode)
84000
§
§
§
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 contain the constant.
(Recall — from page 230 — 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.
Keystrokes
(RPN mode)
4.38\\
\
15
§
O75
§
O250
§
*
You may want to compare this method of arithmetic calculations with constants to the method
using F described on page 91.
File name: hp 12c pt_user's guide_English_HDPMF123E27
Printed Date: 2005/8/1
Display
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.
Display
4.38
Enters constant into Y-, Z-, and
T-registers.
15.
Enters first quantity into displayed
X-register.
65.70
Cost of a package of 15.
75.
Clears display and enters second
quantity into displayed X-register.
328.50
Cost of a package of 75.
250.
Clears display and enters third
quantity into displayed X-register.
1,095.00
Cost of a package of 250.
Page: 236 of 275
Dimension: 14.8 cm x 21 cm
*