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A tradesman, by means of a false balance defrauds 10 percent in buying goods and also defrauds 10 percent in selling. His gain percent is
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- 10%
- 11%
- 21%
- 100%
Correct Option: C
As per the given question ,
| Gain percent = |  | ( 100 + 10 ) | × ( 100 + 10 ) - 100 |  | % | |
| 100 |
| Gain percent = | | 110 | × 110 - 100 | | % | |
| 100 |
Gain percent = (121 – 100)% = 21 percent
