A boy measured the length and breadth of a rectangular lawn as 59.6m and 40.3m respectively instead of 60m and 40m. What is the percentage error in his calculation of the perimeter of the lawn?

A. 10%
B. 1.4%
C. 7%
D. 0.2%
E. 0.1%

Correct Answer: Option E

E. 0.1%

Explanation
Length = 59.6m
Breath = 40.3m
Perimeter = (59.6m + 40.3m) x 2
= 99.9 x 2 = 199.8m
Actual measurement
Perimeter = (60 + 40) x 2 = 100 x 2 = 200m
Error = 200m – 199.8m = 0.2
Error =
0.2/200
=
100/1
= 0.1%