An error 3% in excess is made while measuring the side of a square. The percentage of error in the calculated area of the square is:  Choose one:
A) 6.05
B) 6.09
C) 6.03
D) 6.02
E) 6.01

Rationale: "explanation : 100 cm is read as 103 cm . a 1 = ( 100 × 100 ) cm 2 = 10000 and a 2 = ( 103 × 103 ) cm 2 = 10609 ( a 2 - a 1 ) = 10609 - 10000 = 609 = > 609 / 10000 * 100 = 6.09 answer : b"
Answer: B