If the area of a square increases by 69%, then the side of the square increases by ----
A
13%
B
30%
C
39%
D
69%
Correct Answer: 30%
let, the side length of the original square = 10. Thus, the area of the original square = 100. Since the area of the square increases by 69 percent, the area of the new square = 169. Thus, the side length of the new square = √169 = 13, increase in the side length of the original square = (13 - 10)/10 * 100% = 30% ans: 30%