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Percent means many hundredths.Example: z% is z percent which means z hundredths. It will be written as:

z% = ^{z}⁄_{100}

^{p}⁄_{q} as percent: (^{p}⁄_{q} x 100)%

If the price of a commodity increases by R%, then the reduction in consumption so as not to increase the expenditure is:

[^{R}⁄_{(100 + R)}x 100]%

If the price of a commodity decreases by R%, then the increase in consumption so as not to decrease the expenditure is:

[^{R}⁄_{(100 - R)}x 100]%

The population of a city is P and let it increases at the rate of R% per annum:

Population after t years: P(1 + ^{R}⁄_{100})^{t}

Population t years ago: ^{P}⁄_{(1 + R⁄100)t}

Let V be the present value of machine. Suppose it depreciates at the rate of R% per annum:

Machine's value after t years:P(1 - ^{R}⁄_{100})^{t}

Machine's value t years ago: ^{P}⁄_{(1 - R⁄100)t}

[**If P is R% more than Q, then Q is less than P by how many percent?**^{R}⁄_{(100 + R)}x 100]%

[**If P is R% more than Q, then Q is more than P by how many percent?**^{R}⁄_{(100 - R)}x 100]%

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