What will be the percentage increase in the area of the cube's surface if each of the cube's edges grows by 60%?
Pick one:
A) 150 %  B) 160 %  C) 156 %  D) 158 %  E) 162 %

Rationale: "the question is very easy . my logic is the following : a surface = 6 * a ^ 2 after 60 % increase a surface = 6 * ( ( 1.6 a ) ^ 2 ) = 6 * 2.56 * a ^ 2 the increase in the surface area = ( 6 * 2.56 * a ^ 2 - 6 * a ^ 2 ) / 6 * a ^ 2 = ( 6 * a ^ 2 ( 2.56 - 1 ) ) / ( 6 * a ^ 2 ) = 2.56 - 1 = 1.56 = 156 % answer : c"
Answer: C