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The dimensions of a brick are 2cm x 3.4cm x 6.42cm. Find the percentage error in the calculation of its area.        

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Relative error = 0.5/2 + 0.05/3.4 + 0.005/6.42 = 0.26548 
Working Product = 2 x 3.4 x 6.42 =43.656
Percentage error = 0.2654843.656  x 100 = 0.608%

                                

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