HP 20b HP 20b Calculator Quick Start Guide - Page 33

Simple Percentages

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Mathematical Calculations 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. 33

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Mathematical Calculations
33
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.