HP 12C Financial calculator - Manual (Page 178)

178 Appendix A: The Automatic Memory Stack
File name: hp 12c_user's guide_English_HDPMBF12E44 Page: 178 of 209
Printered Date: 2005/7/29 Dimension: 14.8 cm x 21 cm
Keystrokes Display
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.
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 172 — 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 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.
* You may want to compare this method of arithmetic calculations with constants to the method
using F described on page 74.