<PRE><B>Question 1047396</B>
Let the stiffness be denoted by S, the width be denoted by w, the thickness by t and the length by l
Given S = k (w*t)/l^2 where k is a constant.
if all the dimensions are increased by 10% the new dimensions are 1.1w, 1.1t and 1.1l . So the new stiffness (S1) is 
 S1= k(1.1w*1.1t)/(1.1l)^2
S1=k(1.21wt)/1.21l^2
  =kwt/l^2

S1-S = kwt/l^2 -kwt/l^2
     =0

Hence, there is no change</PRE>