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A dishonest milkman professes to sell his milk at C. P. But he mixes it with water and thereby gains 25 %. The % of water in the mixture is —
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- 25%
- 20%
- 4%
- None of these
Correct Option: B
Let C. P. of 1 litre of milk be Rs. 1
Then S. P. of 1 litre of mixture = Rs. 1
Given that :- Gain = 25%
| ∴ C. P. of 1 litre of mixture = Rs. |  | × 1 |  | 125 |
| C. P. of 1 litre of mixture = Rs. | 5 |
| ∴ Ratio of milk and water = | : | 5 | 5 |
| ∴ Percentage of water in the mixture = | | | % | 5 |
Hence, percentage of water in the mixture = 20 %
