An error 5% in excess is made while measuring the side of a square. The percentage of error in the calculated area of the square is:
Choices:
A) 10.01 B) 9.25 C) 10.25 D) 8.25 E) 6.25

Rationale: "explanation : 100 cm is read as 105 cm . a 1 = ( 100 × 100 ) cm 2 = 10000 and a 2 = ( 105 × 105 ) cm 2 = 10816 ( a 2 - a 1 ) = 11025 - 10000 = 1025 = > 1025 / 10000 * 100 = 10.25 answer : c"
Answer: C