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The cost price of 18 articles is equal to the selling price of 15 articles. The gain percent is :
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- 15%
- 20%
- 25%
- 18%
Correct Option: B
Let Cost price of each article is ₹ 1 .
Cost price of 15 articles = ₹ 15
Selling price of 15 articles = ₹ 18
Gain = 18 - 15 = ₹ 3
| Gain % = | × 100 | Cost price of 15 articles |
| Gain % = | × 100 = 20 % | 15 |
Second method to solve this question :
Here, p = 18, q = 15
| Gain% = |  | p - q |  | × 100 | |
| q |
| Gain % = | | 18 - 15 | | × 100 | |
| 15 |
| Gain % = | × 100 = 20 % | 15 |
