A) 50
B) 125
C) 750
D) 300
Correct Answer: B
Solution :
Suppose each edge of a cube is\[100\text{ }cm\]. After increase by 50% the edge \[=150\text{ }cm\] Surface area of the cube before increase \[=6\times 100\times 100\] \[=60000\,c{{m}^{2}}\] and surface area of the cube after increase \[=6\times 150\times 150\] \[=135000\,c{{m}^{2}}\] \[\therefore \] Increase in the surface \[=135000-60000\] \[=75000\text{ }c{{m}^{2}}\] Hence per cent of increase in the surface \[=\frac{75000\times 100}{60000}=125\]
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