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?
Let he buy 4 litres
CP = 4*25 = 100
he add 1/4th quantity = 1 litre of water
now total quantity = 5 litres
he sold at 26 per litre
SP = 5*26 = 130
gain = 30
%gain = $$\frac{30}{100} \times 100 = 30$$%
so the answer is option C.
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