Question

plz solve... ........!!!!!!

Answer 1

let side of cube is 100 cm 
surface aera = 6*100^2 
when each edge is increased by 25 % then 
S. A = 6 * (125)^2 
so increase in area = 6 [125^2 - 100^2) = 6*225*25 cm^2 
% increase = 6*225* 25 *100/6*100^2 
= 225*25/100 
=56.25% ANSWER