Section 5: Additional Operating Features

75

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

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 177.

Recovering From Errors in Digit Entry

Example: Suppose you want to divide the total annual production for one of your firm’s products (429,000) by the number of retail outlets (987) in order to calculate the average number distributed by each outlet. Unfortunately, you mistakenly key in the number of outlets as 9987 rather than as 987. It’s easy to correct:

Keystrokes

429000\

9987

z

gF

429000\

987z

Display

429,000.00

9,987. You haven’t noticed your mistake yet.

42.96About 43 products per outlet — but that seems too low!

9,987.00

Recalls to the display the number

 

that was there before you press z.

 

You see that you keyed it in wrong.

429,000.00

Begins the problem over.

434.65The correct answer.

File name: hp 12c_user's guide_English_HDPMBF12E44

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Printered Date: 2005/7/29

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