The side of a square is increased by 10% then how much % does its area increases? Select the correct option
A) 21
B) 56.25
C) 50.75
D) 42.75
E) 52.75

Rationale: "a = 100 a 2 = 10000 a = 110 a 2 = 12100 - - - - - - - - - - - - - - - - 10000 - - - - - - - - - 2100 100 - - - - - - - ? = > 21 % answer : a"
Answer: A