If each side of a square is increased by 25%, find the percentage change in its area.
Choose the correct choice:
A) 46.25%  B) 56.25%  C) 56%  D) 50.25%  E) 36.25%
Let each side of the square be a. Then, area = a2.   New side =(125a/100) =(5a/4). New area = (5a/4) 2=(25a2)/16.   Increase in area = ((25 a2)/16)-a2=(9a2)/16.   Increase% = [((9a2)/16)*(1/a2)*100] % = 56.25%.   ANSWER 56.25% 56.25%
<result>B</result>
If each side of a square is increased by 25%, find the percentage change in its area.