HP 12C Financial 12C O75, 4.38, O250, 84,000, 1,095.00, X-register, 168,000.00, 336,000.00, 672,000.00, X-register, Page: 236 of, Cost of a package of, Cost of a package of

236 Appendix A: RPN and the Stack

Keystrokes	Display
(RPN mode)
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 Obefore 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 Ois 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\\

\

Display

4.38Enters 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 91.

File name: hp 12c pt_user's guide_English_HDPMF123E27	Page: 236 of 275
Printed Date: 2005/8/1	Dimension: 14.8 cm x 21 cm