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Concepts on Percentage:
Percent means for every 100So, when percent
is calculated for any value, it means that we
calculate the value for every 100 of the reference value.
percent is denoted by the symbol %. For example,
x percent is denoted by x%
x% = x/100, e.g.: 25%=25/100=1/4
To express x/y as a percent, we have x/y=(x/y×100)%
Example: 1/4=(1/4×100)%=25%
If the price of a commodity increases by R%,
the reduction in consumption so as not to increase
the expenditure = [R/(100+R)×100]%
If the price of a commodity decreases by R%,
the increase in consumption so as not
to decrease the expenditure = [R/(100-R)×100]%
If the population of a town = P and it increases
at the rate of R% per annum, then Population after
n years = P(1+R/100)n
If the population of a town = P and it increases
at the rate of R% per annum, then Population
before n years = P/(1+R/100)n
If the present value of a machine = P and
it depreciates at the rate of R% per annum,
Then Value of the machine after n years = P(1-R/100)n
If the present value of a machine = P and
it depreciates at the rate of R% per annum,
Then Value of the machine before n years = P/(1-R/100)n
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