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The length of a rectangle is decreased by 10% and its breadth is increased by 10%. By what per cent is its area changed ?
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- 0%
- 1%
- 5%
- 100%
- 0%
Correct Option: B
Using Rule 10,
Let the length and breadth of a rectangle are changed by x and y per cent respectively, then the net change
| = |  | x + y + |  | % | |
| 100 |
, where positive and negative signs show increase and decrease respectively.
| ∴ Net change = - 10 + 10 - | = - 1% | |
| 100 |
