An error 2% in excess is made while measuring the side of a square. The percentage of error in the calculated area of the square is: Options.
A) 1.04	B) 2.04	C) 3.04	D) 4.04	E) none of these

Rationale: "explanation : 100 cm is read as 102 cm . a 1 = ( 100 × 100 ) cm 2 and a 2 = ( 102 × 102 ) cm 2 ( a 2 - a 1 ) = [ 1022 - 1002 ] = ( 102 + 100 ) x ( 102 - 100 ) = 404 cm 2 answer : d"
Answer: D