A milkman makes 20% profit by selling milk mixed with water at Rs. 9 per litre, if the cost price of 1 litre pure milk is Rs. 10, then the ratio of milk and water in the said mixture is = ?
Options:
| A. | 3 : 1 |
| B. | 4 : 1 |
| C. | 3 : 2 |
| D. | 4 : 3 |
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