HP 12C Financial 12C 1,095.00, Arithmetic Calculations With Constants, Section 5: Additional Operating Features

Section 5: Additional Operating Features 91

The ~ key is also useful for checking the first number entered to make sure you keyed it in correctly. Before pressing the operation key or equals key, however, you should press ~ again to return the second number entered to the display. Regardless of how many times you press ~, the calculator considers the number in the display to be the second number entered.

The Key in RPN Mode

Occasionally you may want to recall to the display the number that was there before an operation was performed. (This is useful for doing arithmetic calculations with constants and for recovering from errors in keying in numbers.) To do so, press gF(LAST X). This section describes how to use gFin RPN mode.

Arithmetic Calculations With Constants

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)

15\

4.38

§

75

gF

§

250

gF

§

Display

15.00Keys first quantity into calculator.

4.38Keys unit cost into display.

65.70Cost of a package of 15.

75.Keys second quantity into display.

4.38Recalls unit cost — which was last number in display before §was pressed — into display.

328.50Cost of a package of 75.

250.Keys third quantity into display.

4.38Recalls unit cost into display again.

1,095.00 Cost of a package of 250.

Another method for doing arithmetic calculations with constants is described on page 235.

File name: hp 12c pt_user's guide_English_HDPMF123E27	Page: 91 of 275
Printed Date: 2005/8/1	Dimension: 14.8 cm x 21 cm