Problem: Each edge of a cube is increased by 50%. The percent of increase in the surface area of the cube is:
Answer Choices:
A. 50
B. 125
C. 150
D. 300
E. 750
Solution:
S( old )=6x2S (new) =6(1.5x)2=13.50x2
Increase =7.5x2=45​(6x2)
Increase (%) =125