HP 15C Instrukcja Użytkownika Pobierz pdf (Strona 30)

30 Section 2: Numeric Functions

For example, to find the sales tax at 3% and total cost of a $15.76 item:

Keystrokes

Display

15.76 v

15.7600

Enters the base number (the price).

3 |k

0.4728

Calculates 3% of $15.76 (the tax).

16.2328

Total cost of item ($15.76 + $0.47).

Percent Difference. The ∆ function calculates the percent difference

between two numbers. The result expresses the relative increase (a positive

result) or decrease (a negative result) of the second number entered

compared to the first number entered.

For example, suppose the $15.76 item only cost $14.12 last year. What is

this 

Keystrokes

Display

15.76 v

15.7600

This year's price (our base number)

14.12 |∆

-10.4061

Last year's price was 10.41% less

than this year's price.

Polar and Rectangular Coordinate Conversions

The : and ; functions are provided in the

HP-15C for conversions between polar

coordinates and rectangular coordinates. The



degrees (in a decimal format, not a minutes-

seconds format), radians, or grads. θ is

measured as shown in the illustration at right.

Polar Conversion. Pressing |:

(polar) converts a set of rectangular coordinates (x, y) to polar coordinates

(magnitude r, angle θ). The y-value must be entered first, the x-value

second. Upon executing |: r will appear in the display. Press ®

(X exchange Y) to bring θ out of the Y-register and into the display (X-

and  radians, or between -200 and 200 grads.

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HP 15C Instrukcja Użytkownika Strona 30