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Solution
Let's say side of square is 100 unit
its area will be $$10^{4} unit^{2}$$
after 10% increment its value will be 110 unit
and area will become $$1.21 \times 10^{4} unit^{2}$$
change in area  $$ .21 \times 10^{4} unit^{2}$$
percentage change will be 21
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