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A fruit vendor bought bananas at the rate of 5 for a rupee and sold them 4 for a rupee. The per cent gain or loss is
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12 1 % gain 2 - 25% loss
- 25% gain
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12 1 % loss 2
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Correct Option: C
Let the vendor buy 20 (LCM of 5 and 4) bananas.
CP of 5 bananas = $ 1
∴ CP of 20 bananas = $ 4
and SP of 4 bananas = $ 1
∴ SP of 20 bananas = $ 5
Gain = SP of 20 bananas - CP of 20 bananas = 5 - 4 = $ 1
| ∴ Gain % = | × 100 = 25% | 4 |
Second method to solve this question :
Here, a = 5, p = 1 and b = 4, q = 1
| Gain % = |  | aq - bp |  | × 100% | |
| bp |
| Gain % = | | 5 × 1 - 4 × 1 | | × 100% | ||
| 4 × 1 |
| Gain % = | × 100% = 25% | 4 |
