If each edge of a cube is increased by 40%, the percentage

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If each edge of a cube is increased by 40%, the percentage increase in its surface area is

Using Rule 10,

Required percentage increase =		40 + 40 +	40 × 40		% = 96%
			100

Or
Let edge = 10, S. Area = 600,
New edge = 14 ⇒ New surface area = 6 × 142 = 6 × 196 = 1176.

% increase =		1176 - 600		100
		600

=	576	= 96%
	6