A dishonest person wants to make a profit on the selling of milk. He would like to mix water (costing nothing) with milk costing 33 $ per litre so as to make a profit of 20% on cost when he sells the resulting milk and water mixture for 36$. In what ratio should he mix the water and milk?
Choose the correct choice from the following options.
A) 1 : 20	B) 1 : 10	C) 1 : 8	D) 1 : 4	E) 1 : 2

Rationale: "he needs to make a profit of 20 % , which means he needs to sell the milk + water combination for 39.6 ( 20 % of 33 + 33 ) now , he plans to sell 1 liter of this solution of milk and water for 36 . which means he needs to sell 1.1 liters of this solution to earn 39.6 . ( 36 for 1 liter and so 39.6 for 1.1 liters ) hence the water added would be . 1 liter . therefore the ratio of water to milk is . 1 / 1 = 1 / 10 answer : b"
Answer: B