A seller has a chemical that costs Rs.25 per litre. He wants to sell an adulterated mixture at Rs.20 per litre and make a profit of \(25 \%\). What is the ratio in which the seller should add water to the mixture to earn his desired profit?
A man bought 20 litres of milk at 4 rupee per litre . He adds 2 litre water to it so as to make it 22 litre. At what rate per litre should he sell the milk so that he gets a profit of 10%.