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HP 12c - F2230A Manual

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Section 2: Percentage and Calendar Functions 27
File name: hp 12c_user's guide_English_HDPMBF12E44 Page: 27 of 209
Printered Date: 2005/7/29 Dimension: 14.8 cm x 21 cm
Net Amount
A net amount — that is, the base amount plus or minus the percentage amount —
can be calculated easily with your hp 12c, since the calculator holds the base
amount inside after you calculate a percentage amount. To calculate a net amount,
simply calculate the percentage amount, then press
=
or
-
.
Example:
You’re buying a new car that lists for $13,250. The dealer offers you
a discount of 8%, and the sales tax is 6%. Find the amount the dealer is charging
you, then find the total cost to you, including tax.
Keystrokes Display
13250\
13,250.00
Keys in the base amount and
separates it from the percentage.
8b
1,060.00
Amount of discount.
-
12,190.00
Base amount less discount.
6b
731.40
Amount of tax (on $12,190).
=
12,921.40
Total cost: base amount less discount
plus tax.
Percent Difference
To find the percent difference between two numbers:
1. Key in the base number.
2. Press \ to separate the other number from the base number.
3. Key in the other number.
4. Press à.
If the other number is greater than the base number, the percent difference will be
positive. If the other number is less than the base number, the percent difference
will be negative. Therefore, a positive answer indicates an increase, while a
negative answer indicates a decrease.
If you are calculating a percent difference over time, the base number is typically
the amount occurring first.
Example:
Yesterday your stock fell from 58
1
/
2
to 53
1
/
4
per share. What is the
percent change
?
Keystrokes Display
58.5\
58.50
Keys in the base number and
separates it from the other number.
53.25
53.25
Keys in the other number.
à
–8.97
Nearly a 9% decrease.
… 27 …


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