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While doing his physics practical Idowu recorde... - WAEC Mathematics 1990 Question

While doing his physics practical, Idowu recorded a reading as 1.12cm instead of 1.21cm. Calculate his percentage error

A
1.17%
B
6.38%
C
7.44%
D
8.035%
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Correct Option: C

%error = \(\frac{1.21 - 1.12}{1.21} \times 100%\)

= \(\frac{9}{121} \times 100%\)

= 7.44%

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