13. Ankita wants to build a hedge around her rectangular garden but wants to leave some space on two sides for fair passage. If the length of the garden is 10 m 90 cm and breadth is 725 cm and she wants to leave a space of length 1.5 m. Find the length of hedge needed to cover the boundary of the garden
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Answer:
Let x be initial length of each side
Area =x×x=x
2
Now since each length is increased by 10%
New length =x+
100
10
x=
10
11
x
New area =
10
11
x×
10
11
x=
100
121
x
2
Newarea=x
2
+
100
21
x
2
= old area +21% of old area
∴ percent of increase is 21%
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