Question
If each edge of a cube is increased by 50% Find the percentage increase in its surface area .
Answer: Option D
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Let original length of each edge = a
Then, original surface area = 6`a^2`
New edge = (150% of a ) =` ( 150/100 a)` = `(3a)/(2)`
New surface area = `6 xx ((3a)/(2))^2 = 27/2 a^2`
Increase percent in surface area = `(15/2 a^2 xx (1)/(6a^2) xx 100)` % = 125%
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