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One side of a square is increased by 30%. To maintain the same area, the other side will have to be decreased by
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23 1 % 13
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76 12 % 13
- 30%
- 15%
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Correct Option: A
Using Rule 10,
If the required percentage be x, then
| 30 - x - | = 0 | |
| 100 |
⇒ 300 – 10x – 3x = 0
 | Percentage Effect = |  | x + y + |  | % |  | |
| 100 |
⇒ 13x = 300
| ⇒ x = | = 23 | % | ||
| 13 | 13 |
