An error 6% in excess is made while measuring the side of a square. The percentage of error in the calculated area of the square is: Choose the most appropriate option.
A) 12.36 B) 8.36 C) 9.36 D) 10.36 E) 11.36

Rationale: "explanation : 100 cm is read as 106 cm . a 1 = ( 100 × 100 ) cm 2 = 10000 and a 2 = ( 106 × 106 ) cm 2 = 11236 ( a 2 - a 1 ) = 11236 - 10000 = 1236 = > 1236 / 10000 * 100 = 12.36 answer : a"
Answer: A