27%
14%
9%
3%
Correct answer is C
Actual thickness = 34 - 22 = 12 error thickness = 30 - 20 = 10 error = 12 - 10 = 2mm that is, (11 ± 1)mm %error = \(\frac{1}{11}\) x \(\frac{100}{1}\) = 9%
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