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A shopkeeper gains 20% while buying the goods and 30% while selling them. Find his total gain percent.
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- 50%
- 36%
- 56%
- 40%
Correct Option: C
As we know that ,
For two consecutive gains of a % and b %,
| Effective gain = |  | a + b + | ab |  | % | |
| 100 |
Here , a = 20% , b = 30%
| His total gain percent = | | 20 + 30 + | 20 × 30 | | % | |
| 100 |
| ∴ Total gain percent = | | 50 + | 600 | | = 56% | |
| 100 |
