Answers

2015-01-24T17:52:45+05:30
Initial side of the cube = a initial surface are of the cube=6a^2 ......1
New side of the cube=a+10%of a 
                                  = 11a/10new surface area= 6*(11a/10)^2 ........2
% increase = new surface area-old surface area/ old surface area * 100

2-1/1 * 100
= 21% ( ans)
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2015-01-24T18:23:41+05:30

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Initial length of side of the cube = a
Initial Surface area = 6 a²

If the length is increased by 10%;
10% of a = (10/100)*a = a/10 = 0.1a
length of side of the cube = a+0.1a = 1.1a
Final surface area=  6(1.1a)² = 6*1.21a² = 7.26 a²

Percentage increase is

 \frac{(Final\ surface\ area\ -\ initial\ surface\ area)}{initial\ surface\ area} *100 \\  \\  \frac{7.26a^2 -\ 6a^2}{6a^2} *100= \frac{1.26}{6}*100=21\ percent

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