An error 4% in excess is made while measuring the side of a square. What is the percentage of error in the calculated area of the square?  Choose the correct choice from the following answers.
A) 4.05 %  B) 4.02 %  C) 8.16 %  D) 3 %  E) 2 %

Rationale: "percentage error in calculated area = ( 4 + 4 + ( 4 ã — 4 ) / 100 ) % = 8.16 % answer : c"
Answer: C