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40 2: Arithmetic
File name : English-M02-1-040308(Print).doc Print data : 2004/3/9
Note that you must include a
*
for multiplication; parentheses do not
imply multiplication.
The Percent Key
The
%
key has two functions:
Finding a Percentage. In most cases,
%
divides a number by 100.
The one exception is when a plus or minus sign precedes the number.
(See “Adding or Subtracting a Percentage,” below.)
For instance, 25
%
results in

.
To find 25% of 200, press: 200
*
25
%
=
. (Result is

.)
Adding or Subtracting a Percentage. You can do this all in one
calculation:
For instance, to decrease 200 by 25%, just enter 200
-
25
%
=
.
(Result is

.)
Example: Calculating Simple Interest. You borrow $1,250 from a
relative, and agree to repay the loan in a year with 7% simple interest.
How much money will you owe?
Keys: Display: Description:
1250
+
7
%
 Interest on the loan is
$87.50.
=
 You must repay this
amount at the end of one
year.
The Mathematical Functions
Some of the math functions appear on the keyboard; others are in the
MATH menu. Math functions act on the last number in the display.
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