A boy measured the length and breath of a rectangular lawn as 59.6m and 40.3m...
MATHEMATICS
WAEC 1996
A boy measured the length and breath 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. 0.1%
Correct Answer: D. 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 x 100/1
= 0.1%
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