An error 10% in excess is made while measuring the side of a square. Now What is the percentage of error in the calculated area of the square?	Choose the correct answer:
A) 6.64 %
B) 16.64 %
C) 15.64 %
D) 21 %
E) 10.64 %

Rationale: "percentage error in calculated area = ( 10 + 10 + ( 10 ã — 10 ) / 100 ) % = 21 % answer : d"
Answer: D