Question 145

If the length of a rectangle is increased by 10% and its breadth is decreased by 10%, the change in its area will be:


let's say length is 100 and width is also 100 hence area will be $$10^{4}$$  $$unit^{2}$$
after 10% increase, length will be 110 and 10% decrease in width, it will be 90 and area will be 9900  $$unit^{2}$$
%change in area will be = $$\frac{100}{10000}\times100$$ = 1%

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