Percentage - Quantitative Aptitude (MCQ) questions for Q. 58

Q.  While calculating the edge of a square, a worker makes an error of 2% in excess. What % error does he make in calculating area? (%)
- Published on 12 Jun 15

a. 4.04
b. 4
c. 40.4
d. 4.004

ANSWER: 4.04
 
Given Error = 2% while measuring the side of a square.

If the correct value of the side of square is 100, the measured value:

=> 100 + 2% *100

= 100+2=102

The area of square with edge 100 = side*side

=> 100*100

=> 10000

The area of square with side 102 = 102*102= 10404

Error in area calculation = 10404-1000 = 404

% error= (404/10000)*100
= 4.04%

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