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If the length of a rectangle is increased by 20% and its breadth is decreased by 20%, then its area
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- increases by 4%
- decreases by 4%
- decreases by 1%
- remains unchanged
- increases by 4%
Correct Option: B
Using Rule 10,
| Effective change in area = |  | x + y + |  | % | |
| 100 |
where x and y denote percentage change
| = | | 20 - 20 - | | % = - 4% | |
| 100 |
Hence, the area will decrease by 4%
