Tips to solve percentage questions fast
Percentages Tips and Tricks
How to solve frequently asked percentage questions fast?
Percentages is the important and easily scoring topic where the candidate can except easier questions.
Solving these questions with traditional approach is time consuming. To avoid this, interview stuffs provide you tips to solve these type of most frequently asked percentages questions in 2 seconds.
For instance if salary of A is X and lets say 100% more salary that of B means,
Let’s assume B’s salary is 30,000 then A’s Salary is 60,000
Then question will be asked like this by what % B’s Salary is less than that of A:
you may wrongly assume it as 100% by seing A and B salary remaining same in both scenarious.
We need to compute the % less from A’s perspective of updated salary like
A is 60000, B is 30000 which clearly portrays B is 50% less than A (since, 50% of A is 30000)
And A is 100% more than B (here we have to think in terms of B – to make 60000 we need to add 30000 to A which is 100% value of it)
Now let’s see short cut to solve these questions in matter of 2 secs
If Salary of A is X% (assume 25%) more than B, then B’s Salary is — % less than A ?
Tip to Solve:
Here, it’s asking the percentage B’s value is less than that of A’s
25 % is 1/4, focus on the word less in the question, means we need to decrease the fraction value.
We can decrease the fraction value by decreasing the numerator value or by increasing the denominator value, always follow denominator approach.
So now, what amount we need to increase the denominator?
we need to increase the denominator with the number present in numerator.
Numerator/Denominator + numerator i.e.., 1/4+1 = 1/5 which equals 20 %
Here, we can say B’s salary is 20% less than A.
If Salary of A is X% (assume 50%) less than B, then A’s Salary is — % more than A ?
Tip to Solve:
Here, it’s asking the percentage B’s value is more than that of A’s
50 % is 1/2, focus on the word more in the question, means we need to increase the fraction value.
We can increase the fraction value by increasing the numerator value or by decreasing the denominator value, always follow denominator approach.
So now, what amount we need to decrease the denominator?
we need to decrease the denominator with the number present in numerator.
Numerator/Denominator – numerator i.e.., 1/2-1 = 1/1 which equals 100 %
Here, we can say B’s salary is 100% more than A.
Tips to remember percentage values easily:
|Days taken to complete work||Work done in one day||Efficiency in %||Tips to Remember fraction|
|n||1/n||100/n||To get any % multiply fraction with 100|
|2||1/2||50||half of 100|
|3||1/3||33.33||denom 3: all 3's in %|
|4||1/4||25||Quarter of 100|
|5||1/5||20||100/5 = 20|
|6||1/6||16.66||denom 6: 3 6's in the %|
(7*2).(7*4) = 14.28
|8||1/8||12.5||denom 8: 1 + 2 + 5 -- 12.5|
(20-9).(20-9) = 11.11
(20-11):(20-11) = 09.09
|20||1/20||5||below all denom are multiplied by 10, so remember corresponding single digit % and divide them by 10|
|30||1/30||3.33||33.33/10 = 3.33|