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40percent

40 percent refers to the proportion 40 out of 100, and is commonly written as 40% or 40 percent. As a decimal, it is 0.4, and as a fraction it equals 2/5. It is used to describe parts of a whole in a wide range of contexts, including finance, statistics, science, and daily life.

Origin and notation: The word percent comes from the Latin per centum, meaning "by the hundred." The

Usage and applications: Percentages express relative shares rather than absolute counts. They appear in discounts and

Calculation and conversion: To convert a percentage to a decimal, divide by 100 (40% = 0.40). To convert

See also: Percent, Per mille, Per centum.

percent
sign
(%)
developed
as
a
shorthand
representation
of
this
concept
and
is
placed
after
the
numeric
value
to
indicate
a
proportion
out
of
100.
pricing,
interest
and
tax
rates,
exam
scores,
survey
results,
and
demographic
data.
For
example,
a
40%
discount
lowers
a
price
to
60%
of
its
original
amount,
while
a
40%
probability
suggests
a
0.4
likelihood
of
a
given
outcome.
a
decimal
to
a
percentage,
multiply
by
100
(0.40
=
40%).
To
express
40%
as
a
fraction,
40%
equals
2/5.
A
practical
example:
40%
of
250
equals
100.