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**Percentage**

- By percent, we mean that many hundredths.
- Thus x percent means x/100, written as x%.
- A fraction whose denominator is 100 is called a percentage and the numerator of the fraction is called rate per cent.
- A student gets 60% marks in arithmetic means that he obtained 60 marks out of 100. So if full marks are 500 he gets ${\frac{60}{100}\times 500}$ = 300 marks.

Let P be the population of a town now. Let it increase at R% per annum.

Let the present value of a machine is Rs. P. Let it depreciate at R% per annum. Then

6.

Increase % in consumption = ${[\frac{R}{100-R}\times 100]}$%

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