Percentage tricks

Percentages can be done mentally both accurately and rapidly using this cool math trick.
You can solve Percentage problems mentally.Become a genius !

You have to learn below tables in order to master percentage and it problems.

Percentage Basics
(1/2)	50%		(1/20)	5%
(1/3)	33(1/3)%		(1/25)	4%
(1/4)	25%		(1/50)	2%
(1/5)	20%		(3/8)	37(1/2)%
(1/6)	16(2/3)%		(5/8)	62(1/2)%
(1/7)	14(2/7)%		(4/7)	57(1/7)%
(1/8)	12(1/2)%		(5/7)	71(3/7)%
(1/9)	11(1/9)%		1	100%
(1/10)	10%
(1/11)	9(1/11)%
(1/12)	8(1/3)%
(1/13)	7(9/13)%
(1/14)	7(1/7)%
(1/15)	6(2/3)%
(1/16)	6(1/4)%

157(1∕7)

=100%+57(1/7)%

=1+4/7

=11/7 Ans

Question 2: If 44(4/9) % of a number is added to itself then result becomes 650.Find the original number.
Solution:
44(4/9)%
=4*11(4/9) %
=4*(1/9)
=4/9 %

In percentage,denominator always denotes original number and numerator is result %.

so as per question 4+9=13
13 units =650
1 units=50
so original number is =9*40=450 ans.

Question 3: In an election,10 % of the voters did not cast their votes,11(1/9)% of the votes out of voting done were considered invalid.The winner got 75% of the valid votes and won by 2000 votes.Find out the total number of voters in the voting list.

[ Try to solve this within 30 seconds ]

Solution:

Let total number of voter be 100

100
| -10 ( 10% voter did not cast)
90
| -10 [119(1/9)% =1/9 and 1+9=10 ]
80

    80
  /      \
75% 25%

Difference of 75% and 25% is 50%.

50% of 80=2000 (given)
40 ---->2000
1------> 50

Then 100 ---> 50 * 100=5000 Answer