What will be the percentage increase in the area of the cube's surface if each of the cube's edges grows by 40%?
Choose the most appropriate option:
A) 95 %
B) 90 %
C) 85 %
D) 96 %
E) 25 %

Rationale: "the question is very easy . my logic is the following : a surface = 6 * a ^ 2 after 40 % increase a surface = 6 * ( ( 1.4 a ) ^ 2 ) = 6 * 1.96 * a ^ 2 the increase in the surface area = ( 6 * 1.96 * a ^ 2 - 6 * a ^ 2 ) / 6 * a ^ 2 = ( 6 * a ^ 2 ( 1.96 - 1 ) ) / ( 6 * a ^ 2 ) = 1.96 - 1 = 0.96 = 96 % answer : d"
Answer: D