Aptitude - Area - Discussion
Discussion Forum : Area - General Questions (Q.No. 2)
2.
An error 2% in excess is made while measuring the side of a square. The percentage of error in the calculated area of the square is:
Answer: Option
Explanation:
100 cm is read as 102 cm.
A1 = (100 x 100) cm2 and A2 (102 x 102) cm2.
(A2 - A1) = [(102)2 - (100)2]
= (102 + 100) x (102 - 100)
= 404 cm2.
| Percentage error = |
 |
404 | x 100 |  % |
= 4.04% |
| 100 x 100 |
Discussion:
40 comments Page 4 of 4.
Pranjal said:
9 years ago
The formula X + Y + (X*Y/100) is the best for square and rectangle.
(1)
Lipu said:
1 decade ago
Error % = (error/true value)*100.
So (404/100*100)*100 = 4.04
So (404/100*100)*100 = 4.04
Anbu said:
1 decade ago
(A2 - A1) = [(102)2 - (100)2] How it come?
Please advise
Please advise
Amrita said:
1 decade ago
To find out error we got to subtract it first.
Sakshi said:
9 years ago
Please explain the last step of the solution.
Aarti said:
1 decade ago
Solution:
x+y+x*y/100 = 2+2+2*2/100 = 4.04.
x+y+x*y/100 = 2+2+2*2/100 = 4.04.
Rohith said:
6 years ago
We can also solve this is in 404/10.
(2)
Mazher said:
1 decade ago
Why we are taking this three 100's ?
Dada khalandar said:
6 years ago
How? Explain the answer please.
Dwaipayan said:
6 years ago
You are right, Thanks @Harsh.
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