Percentages; Swapping Levels 1 And 2 - HP -28S Manual

Percentages
Calculate 40% of 85.
85
1
ENTER
1
40.00
The result is 34.
3: 125
2: 7
1: 34
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For "percent" the order of the numbers doesn't matter. However, the
order is important for "percent change." Calculate the percent change
from 60 to 75.
60
1
ENTER
1
75.1
%CH
1
3: 7
2: 34
1: 25
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The result is +25, meaning that 75 is 25% more than 60.
Swapping Levels 1 and 2
For all the functions where the order of the numbers is important-
subtraction, division, powers, roots, and percent change-you can
switch the order of the numbers by pressing
. 1
SWAP
I.
For example,
you currently have 25 on the stack; suppose you want to calculate
30 - 25.
Key in 30.
30
Swap the order of 25 and 30 .
• 1
SWAP
1
2: 34
1: 25
3130
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3: 34
2: 313
1: 25
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Note that pressing
1
SWAP
I
performed ENTER for you.
2: Doing Arithmetic 43
I