Section 6: Functions83
Now using the display execution form, PI, find the area of Europa, a moon of Jupiter with a diameter of 1950 miles.
Keystrokes Display    
1950
  1950 _    
   
g X2 
  3,802,500.000    
   
XEQ 
  XEQ _ _    
   
ALPHA PI ALPHA 
  3.1416    
  The quantity pi.
 √ó  
  11,945,906.07    
  Area of Europa in square miles.
Percentages
The  %  (percent) function is a two-number function that allows you to compute percentages. To find the percentage of a number:
  1. Key in the base number.
  2. Press ENTER  .
  3. Key in the number representing the percent rate.
  3. Press g  %  .
Example: About 94% of the weight of a tomato is water. If a particular tomato weighs 500 gram, what amount of the weight of the tomato is water?
Keystrokes Display    
500
  500 _    
  The base number.
ENTER  
  500.0000    
   
94
  94 _    
  The percent of water.
g  %  
  470.0000    
  The weight in grams of water in a 500-gram tomato.
When you executed  %  , the stack contents were changed...
  ...from this...           ...to this.  
 
T  0.0000
         
T  0.0000
 
 
Z  0.0000
         
Z  0.0000
 
 
Y  500.0000
  Base.     %    
Y  500.0000
Base.
 
X  94.0000
  Rate.    
X  470.0000
Answer.