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Some articles were bought at 6 for $ 5, and sold at 5 for $ 6. Gain percent is :
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- 5%
- 6%
- 30%
- 44%
Correct Option: D
Let number of articles bought = 6 × 5 = 30
| C.P. of 30 articles = $ |  | 5 | × 30 |  | = $ 25 |
| 6 |
| S.P. of 30 articles = $ | | 6 | × 30 | | = $ 36 |
| 5 |
Gain = S.P. - C.P. = 36 - 25 = $ 11
| ∴ Gain % = | × 100 = 44% | 25 |
We can find required answer with the help of given formula :
Here, a = 6, p = 5 and b = 5, q = 6
| Gain % = | | aq - bp | | × 100% | |
| bp |
| Gain % = | | 6 × 6 - 5 × 5 | | × 100% | |
| 5 × 5 |
| Gain % = | | 36 - 25 | | × 100% | |
| 25 |
| Gain % = | × 100% = 44% | 25 |
