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A milk vendor bought 28 litres of milk a...

A milk vendor bought 28 litres of milk at the cost of Rs. 850 per litre. After adding some water, he sold the mixture at the same price. If he gains 12-5%, how much water did he add ?

A

4.5 litres

B

4 litres

C

3.5 litres

D

3 litres

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