A milkman buys milk at Rs 25 per litre and adds 1/4 of water

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A milkman buys milk at Rs 25 per litre and adds 1/4 of water to it and sells the mixture at Rs 26 per litre. His gain (in %) is?

[2017 SSC CGL 21 Aug Shift-2]

A 25

B 20

C 30

D 15