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The price of an article was decreased by 10% and again reduced by 10%. By what per cent should the price have been reduced once, in order to produce the same effect as these two successive reductions ?
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- 15%
- 19%
- 20%
- 25%
Correct Option: B
Using Rule 6,
A single equivalent reduction to reduction series of x%, y%
| = |  | x + y - |  | % | |
| 100 |
| = | | 10 + 10 - | | % | |
| 100 |
= (20 - 1)% = 19%
