10 Important Percentage Tricks With Examples



Percentage means per cent or per 100
A percentage is a number or ratio which is expressed as a fraction of 100.
Ex. 30%=30/100

1. 

If we have to convert a fraction into % than that number is multiply by 100.
Example
Change 2/5 into percentage.
=2/5×100
=40%

2. 

If we have to convert % into fraction than that number is multipy by 100
Example 
Chnage 25% into fraction.
=25/100
=1/4

3. 

A is % of 'B'.
Example 
45 is what % of 54?


=83.33%

4. 

If 'X' is a% more than 'Y', then 'Y' is % less than 'X'.

Example

If the salary of Ram is 25% more than shyam's salary. Find how much % Shyam's salary is less than Ram's salary?




=20%

5. 

If 'X' is a% less than 'Y', then 'Y' is % more than 'X'.

Example 
If Mohan's height is 10% less than Sohan's height. Find how much % Sohan's salary is more than Mohan's salary?



11.11%

6. 

If the population is 'P' and it is incearsed by 'R%' every year then the population of village after 'n' years is

 
Example
If the poputation of a city is 1.2 Lakh and it is increased by 10% every year. What will be the total population of that village after 2 years?



=145200

7. 

If the population is 'P' and it is incearsed by 'R%' every year then the population before 'n' years is


Example
If the poputation of a city is 119025 and it is increased by 15% every year. What will be the total population of that village before 2 years?




=90000

8. 

If the price of a machine is x rs. and it is depriciated by 'R%' every year then the price of machine after 'n' years is



Example
If the price of a T.v. is 20000 and it is depriciated by 20% every year. What will be the the price of that T.v. after 2 years?



=12800

9. 

If the price of a machine is x rs. and it is depriciated by 'R%' every year then the price of machine before 'n' years is


Example
If the price of a Computer is 8100 rs. and it is depriciated by 10% every year. What was the price of that T.v. before 2 years?



=10000

10. 

If the price of any foodstuff is increased by 'a%' then the comsumption of it will be decreased by % so that the expenses of this item is remain same.

Example
The price of sugar is increased by 10%. How much % consumption of sugar is decreased so that the expenditure of sugar is same?



=9.09%
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