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Salary of a person is first increased by 20%, then it is decreased by 20%. Percentage change in his salary is :
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- 4% decreased
- 4% increased
- 8% decreased
- 20% increased
Correct Option: A
Using Rule 4,
Change in his salary
| = |  | 20 - 20 - |  | % | |
| 100 |
| = | | - | | % = – 4% | |
| 100 |
i.e. 4% decrease
Note : If A is first increased by x% and then decreased by y% the net % change
| = | | x - y - | | % | |
| 100 |
If the result is positive, the change indicates increase and if the result is negative, the change indicates decrease.
