HP 20b Business Consultant - Page 33

Mathematical Calculations
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Note: the FIX= setting only affects the display; it does not affect the actual
numbers.
Simple Percentages
In Algebraic or Chain modes, pressing % divides a number by 100. For
example, pressing 25% returns 0.25.
To find a percentage of a given number, enter the number and multiply it by the
desired percentage, followed by = to return the result. For example, to find
25% of 200, press 200*25%= to return a result of
50 .
To add or subtract a percentage of a number, enter the first number, followed by
+ or - the percentage, followed by %. Finish your calculation with
=, if desired. For example, to add 10% to 50, press
50+10%= to return a result of 55 .
In RPN mode, the % key calculates x percent of the number on level two of the
stack, when x is the number on level one of the stack. It does not modify the
number on level two of the stack, allowing you to perform an addition or a
subtraction after pressing % to add or subtract x % from the number.
For example, 200I25% returns 50 , but 200 is still on
level two of the stack, and pressing - returns 150 , or 200-25%, with the (-)
annunciator displayed on the top line.