An error 2% in excess is made while measuring the sideofa square. The % of error in the calculated area of the square is? Choose the correct choice from the following:
A) 4 %  B) 4.04 %  C) 4.23 %  D) 4.56 %  E) 5 %

Rationale: 100 cm is read as 102 cm . a 1 = ( 100 x 100 ) cm 2 and a 2 ( 102 x 102 ) cm 2 . ( a 2 - a 1 ) = [ ( 102 ) 2 - ( 100 ) 2 ] = ( 102 + 100 ) x ( 102 - 100 ) = 404 cm 2 . percentage error = 404 x 100 % = 4.04 % 100 x 100 b
Answer: B