If each side of a square is increased by 20%, find the percentage change in its area?
Choose the correct answer:
A) 40%
B) 42%
C) 46%
D) 44%
E) 38%
let each side of the square be a , then area = a x a   New side = 120a / 100 = 6a / 5   New area =(6a x 6a) / (5 x 5) = (36a²/25)   increased area== (36a²/25) - a²   Increase %= [(11a²/25 ) x (1/a² ) x 100]% = 44%   answer :44%
<result>D</result>
If each side of a square is increased by 20%, find the percentage change in its area?