math problem pls help

[BodybldgDoc]

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If the side length of a square is increased by 50%, the area increases by what percent?
A. 125
B. 225
C. 25
D. 50
E. 75

please explain how to do this someone?

 

[Ex_EE]

You can just use an example such as 10 x 10 square 100 in area. Increased to 15 x 15 square = 225 area. So 125 % increase

 

[BodybldgDoc]

thanks a lot. i was thinking along the same lines but somehow my brain wasnt functioning early this morning.

 

[Streetwolf]

New_side = 1.5 * Old_side

(New_side)^2 = (1.5 * Old_side)^2 = 2.25*Old_side^2

So the INCREASE is (2.25 - 1) / 1 = 1.25

^ Without using an example such as 10 x 10.