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The base of a triangle is increased by 10%. To keep the area unchanged the height of the triangle is to be decreased by
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9 1 % 11 -
11 1 % 9 - 11%
- 9%
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Correct Option: A
Using Rule 10, Percentage increase
| = |  | x + y + |  | % | |
| 100 |
| ⇒ 0 = | | 10 + y + | | % | |
| 100 |
| ⇒ - 10 = y + | ||
| 10 |
| ⇒ - 10 = | ||
| 10 |
⇒ 11y = – 100
| ⇒ y = | = - 9 | % | ||
| 11 | 11 |
Negative sign shows decrease.
OR
| Percentage decrease = | × 100 | |
| 100 + 10 |
| = | = 9 | % | ||
| 11 | 11 |
