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?
30
Take 4 L of milk. CP \(=4\times 25=\text{Rs. }100\).
Water added \(=\tfrac{1}{4}\times 4=1\) L, giving 5 L of mixture.
SP \(=5\times 26=\text{Rs. }130\). Gain \(=130-100=30\).
\[\text{Gain }\%=\frac{30}{100}\times 100=30\%\]
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