Aptitude - Percentage - Discussion
Discussion Forum : Percentage - General Questions (Q.No. 6)
6.
If 20% of a = b, then b% of 20 is the same as:
Answer: Option
Explanation:
20% of a = b  |
20 | a = b. |
| 100 |
 b% of 20 = |
 |
b | x 20 |  |
= | |
20 | a x | 1 | x 20 | |
= | 4 | a = 4% of a. |
| 100 | 100 | 100 | 100 |
Discussion:
68 comments Page 1 of 7.
Indu said:
1 decade ago
How (1/100)*20 comes?
(2)
Arun . S said:
1 decade ago
Here, 20% of a=b i.e.,(20/100)a=b
then, b%20 i.e.,(b/100)*20---I
then sub b=(20/100)a in I
we get,
=(20/100)a * (1/100) * 20
=(20/100)a * (20/100)
=(400/10000)a
=(4/100)a
= 4% of a
then, b%20 i.e.,(b/100)*20---I
then sub b=(20/100)a in I
we get,
=(20/100)a * (1/100) * 20
=(20/100)a * (20/100)
=(400/10000)a
=(4/100)a
= 4% of a
(1)
Habiba said:
1 decade ago
A man bought a pen for #15 and later sold the pen for #60. What was the percent increase in the price of the pen?
Cosmicguypradeep said:
1 decade ago
@habiha
here is the answer
% increase = (actual increase/original price *100)%
% decrease = (actual decrease/ original price *100)%
so, for this question we have to calculate % increase (since the pen was sold at higher rate 45, which was actually bought for 15 Rs)
(60-15/15 *100)% = 300%.
here is the answer
% increase = (actual increase/original price *100)%
% decrease = (actual decrease/ original price *100)%
so, for this question we have to calculate % increase (since the pen was sold at higher rate 45, which was actually bought for 15 Rs)
(60-15/15 *100)% = 300%.
Mahesh said:
1 decade ago
In earlier sum, how
=(20/100)a * (1/100) * 20 comes,
because if we sub b=(20/100)a in I then that equ'n comes like
((20/100)a)/100*20 then how it comes (20/100)a * (1/100) * 20
=(20/100)a * (1/100) * 20 comes,
because if we sub b=(20/100)a in I then that equ'n comes like
((20/100)a)/100*20 then how it comes (20/100)a * (1/100) * 20
Kcs said:
1 decade ago
Take a=100
b=20%a=20%100=20/100*100=20
b=20
20%b=20/100*20=4
4%a=4%100=4
5%a=5%100=5
20%a=20%100=20
ans=4%.
b=20%a=20%100=20/100*100=20
b=20
20%b=20/100*20=4
4%a=4%100=4
5%a=5%100=5
20%a=20%100=20
ans=4%.
Bharathi Prasath S said:
1 decade ago
((20/100*a=b) => a=5b).
b/100*20=> b/5-->(1) 4% of a = 4/100*5b = b/5---> (2).
(1) = (2).
So option A.
b/100*20=> b/5-->(1) 4% of a = 4/100*5b = b/5---> (2).
(1) = (2).
So option A.
Rajeev said:
1 decade ago
Actually I am unable to understand the explanation you have given. I think you are skipping some steps. Can anyone help me by giving proper answer with step by step.
Anuj said:
1 decade ago
Let assume a =100,then 20% of a=b.
=20/100*100=> 20.
That means b=20.
Then b% of 20.
b/100*20.
It can also be written as (if we put the value of b).
20/100*20 =>4.
=20/100*100=> 20.
That means b=20.
Then b% of 20.
b/100*20.
It can also be written as (if we put the value of b).
20/100*20 =>4.
Manish said:
1 decade ago
20/100*a = b.
=> a/5 = b.
i.e. b = a/5.
No b% of 20 is b/100 *20.
= b/5.
Replacing b with a/5.
= a/25.
= 0.04 a.
= 4% of a.
=> a/5 = b.
i.e. b = a/5.
No b% of 20 is b/100 *20.
= b/5.
Replacing b with a/5.
= a/25.
= 0.04 a.
= 4% of a.
(1)
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