3. Find the percentage increase in the area of a rectangle, if there is an increase of 10% in both length and breadth of the rectangle ?
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area, a = l*b
l1 = l*(1+10%) =1.1l
b1 = b×(1+10%) = 1.1b
a1= l1×b1 = 1.1l×1.1b = 1.21lb = 1.21a
% increase in area = a1-a / a ×100
= 1.21a-a /a ×100 = 21%
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