The percentage increase in surface area of a cube when each side is doubled is
a. 25%
b. 50%
c. 100%
d. 300%
EXPLANATION
Surface area of cube = 4a2
Let a= 10
Original S.A= 4 x 102 = 400
New S.A = 4 x 202 = 1,600
Percentage Increase= 1,600 – 400 / 400 * 100 = 1,200 / 400 * 100 = 300%
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