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The length of rectangle is increased by 60%. By what percent would the breadth to be decreased to maintain the same area ?
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37 1 % 2 - 60%
- 75%
- 120%
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Correct Option: A
Using Rule 10,
For changes of x% and y% in length and breadth respectively, effective change in area
| = |  | x + y + |  | % (decrease with negative sign) | |
| 100 |
| ∴ 60 - y - | = 0 | |
| 100 |
| ⇒ y + | = 60 ⇒ | = 60 | ||
| 5 | 5 |
| y = | = | = 37 | % | |||
| 8 | 2 | 2 |
