Magnification of the square

If we increase the square side, increase the area of the 70 %. About what percentage was increased on its side?

Correct answer:

q =  30.384 %

Step-by-step explanation:

 (a   (1+q/100))2 = a2 + a2 70/100  (1+q/100)2 = 1 + 70/100  q=100 (1+70/1001)=30.384%

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